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1. OBSERVATION OF THE TeV GAMMA-RAY SOURCE MGRO J1908+06 WITH ARGO-YBJ

Author: B. Bartoli1, 2, P. Bernardini3, 4, X. J. Bi5, C. Bleve3, I. Bolognino6, 7, P. Branchini8, A. Budano8, A. K. Calabrese Melcarne9, P. Camarri10, Z. Cao5, R. Cardarelli11, S. Catalanotti1, C. Cattaneo7, S. Z. Chen5, T. L. Chen12, Y. Chen5, P. Creti4, S. W. Cui13, B. Z. Dai14, G. D’Al´ı Staiti15, 16, Danzengluobu12, M. Dattoli17, 18, 19, I. De Mitri3, B. D’Ettorre Piazzoli1, T. Di Girolamo1, X. H. Ding12, G. Di Sciascio11, C. F. Feng20, Zhaoyang Feng5, Zhenyong Feng21, F. Galeazzi8, E. Giroletti6, Q. B. Gou5, Y. Q. Guo5, H. H. He5, Haibing Hu12, Hongbo Hu5, Q. Huang21, M. Iacovacci1, R. Iuppa10, I. James8, H. Y. Jia21, Labaciren12, H. J. Li12, J. Y. Li20, X. X. Li5, G. Liguori6, C. Liu5, C. Q. Liu14, J. Liu14, M. Y. Liu12, H. Lu5, X. H. Ma5, G. Mancarella3, 8, 22, G. Marsella4, D. Martello3, S. Mastroianni2, P. Montini8, C. C. Ning12, A. Pagliaro16, M. Panareo4, B. Panico10, L. Perrone4, P. Pistilli8, X. B. Qu20, F. Ruggieri8, P. Salvini7, R. Santonico10, P. R. Shen5, X. D. Sheng5, F. Shi5, C. Stanescu8, A. Surdo4, Y. H. Tan5, P. Vallania17, S. Vernetto17, C. Vigorito18, B. Wang5, H. Wang5, C. Y. Wu5, H. R. Wu5, B. Xu21, L. Xue20, Y. X. Yan14, Q. Y. Yang14, X. C. Yang14, Z. G. Yao5, A. F. Yuan12, M. Zha5, H. M. Zhang5, Jilong Zhang5, Jianli Zhang5, L. Zhang14, P. Zhang14, X. Y. Zhang20, Y. Zhang5, Zhaxiciren12, Zhaxisangzhu12, X. X. Zhou21, F. R. Zhu21, Q. Q. Zhu5, G. Zizzi91 Dipartimento di Fisica dell’Universit`a di Napoli 'Federico II, ' Complesso Universitario di Monte Sant’Angelo, via Cinthia, 80126 Napoli, Italy2 Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, Italy3 Dipartimento di Matematica e. Fisica 'Ennio De Giorgi, ' Universit`a del Salento, via per Arnesano, 73100 Lecce, Italy4 Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Italy5 Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, P. O. Box 918, 100049 Beijing, China6 Dipartimento di Fisica Nucleare e. Teorica dell’Universit`a di Pavia, via Bassi 6, 27100 Pavia, Italy7 Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Italy8 Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy9 Istituto Nazionale di Fisica Nucleare CNAF, Viale Berti Pichat 6/2, 40127 Bologna, Italy10 Dipartimento di Fisica dell’Universit`a di Roma 'Tor Vergata, ' via della Ricerca Scientifica 1, 00133 Roma, Italy11 Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tor Vergata, via della Ricerca Scientifica 1, Italy12 Tibet University, 850000 Lhasa, Xizang, China13 Hebei Normal University, Shijiazhuang 050016, Hebei, China14 Yunnan University, 2 North Cuihu R.d., 650091 Kunming, Yunnan, China15 Dipartimento di Fisica, Universit`a degli Studi di Palermo, Viale delle Scienze, Edificio 18, 90128 Palermo, Italy16 Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Viale A. Doria 6, 95125 Catania, Italy17 Osservatorio Astrofisico di Torino dell’Istituto Nazionale di Astrofisica, corso Fiume 4, 10133 Torino, Italy18 Istituto Nazionale di Fisica Nucleare, Sezione di Torino, via P. Giuria 1, 10125 Torino, Italy19 Dipartimento di Fisica dell’Universit`a di Torino, Italy20 Shandong University, 250100 Jinan, Shandong, China21 Southwest Jiaotong University, 610031 Chengdu, Sichuan, China22 Dipartimento di Fisica dell’Universit`a 'Roma Tre, ' via della Vasca Navale 84, Italy23 Istituto di Astrofisica Spaziale e. Fisica Cosmica dell’Istituto Nazionale di Astrofisica, via La Malfa 153, 90146 Palermo, Italy, MARI, Stefano Maria, Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cardarelli, R, Catalanotti, S, Cattaneo, C, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui, SW, Dai, BZ, D’Ali Staiti, G, Danzengluobu, Dattoli, M, De Mitri, I, D’Ettorre Piazzoli, B, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Labaciren, Li, HJ, Li, JY, Li, XX, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Qu, XB, Ruggieri, F, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhaxiciren, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, Bartoli, Bruno, Bernardini, P., X. J., Bi, Bleve, C., Bolognino, I., Branchini, P., Budano, A., Calabrese Melcarne, A. K., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, Sergio, Cattaneo, C., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., D'Al? Staiti, G., Dattoli, M., De Mitri, I., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Ding, X. H., Di Sciascio, G., Feng, C. F., Zhaoyang, Feng, Zhenyong, Feng, Galeazzi, F., Giroletti, E., Gou, Q. B., Guo, Y. Q., H. H., He, Haibing, Hu, Hongbo, Hu, Huang, Q., Iacovacci, Michele, Iuppa, R., James, I., Jia, H. Y., H. J., Li, J. Y., Li, X. X., Li, Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., X. H., Ma, Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., X. B., Qu, Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., C. Y., Wu, H. R., Wu, Xu, B., Xue, L., Yan, Y. X., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Jilong, Zhang, Jianli, Zhang, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., B., Bartoli1, P., Bernardini3, X. J., Bi5, C., Bleve3, I., Bolognino6, P., Branchini8, A., Budano8, A. K., Calabrese Melcarne9, P., Camarri10, Z., Cao5, R., Cardarelli11, S., Catalanotti1, C., Cattaneo7, S. Z., Chen5, T. L., Chen12, Y., Chen5, P., Creti4, S. W., Cui13, B. Z., Dai14, G., D’Al´ı Staiti15, 16, Danzengluobu12, M., Dattoli17, 18, 19, I., De Mitri3, B., D’Ettorre Piazzoli1, T., Di Girolamo1, X. H., Ding12, G., Di Sciascio11, C. F., Feng20, Zhaoyang, Feng5, Zhenyong, Feng21, F., Galeazzi8, E., Giroletti6, Q. B., Gou5, Y. Q., Guo5, H. H., He5, Haibing, Hu12, Hongbo, Hu5, Q., Huang21, M., Iacovacci1, R., Iuppa10, I., James8, H. Y., Jia21, Labaciren12, H. J., Li12, J. Y., Li20, X. X., Li5, G., Liguori6, C., Liu5, C. Q., Liu14, J., Liu14, M. Y., Liu12, H., Lu5, X. H., Ma5, G., Mancarella3, Mari, Stefano Maria, 8, 22, G., Marsella4, D., Martello3, S., Mastroianni2, Montini8, P., C. C., Ning12, A., Pagliaro16, M., Panareo4, B., Panico10, L., Perrone4, P., Pistilli8, X. B., Qu20, Ruggieri8, F., P., Salvini7, R., Santonico10, P. R., Shen5, X. D., Sheng5, F., Shi5, C., Stanescu8, A., Surdo4, Y. H., Tan5, P., Vallania17, S., Vernetto17, C., Vigorito18, B., Wang5, H., Wang5, C. Y., Wu5, H. R., Wu5, B., Xu21, L., Xue20, Y. X., Yan14, Q. Y., Yang14, X. C., Yang14, Z. G., Yao5, A. F., Yuan12, M., Zha5, H. M., Zhang5, Jilong, Zhang5, Jianli, Zhang5, L., Zhang14, P., Zhang14, X. Y., Zhang20, Y., Zhang5, Zhaxiciren12, Zhaxisangzhu12, X. X., Zhou21, F. R., Zhu21, Q. Q., Zhu5, G., Zizzi91 Dipartimento di Fisica dell’Universit`a di Napoli 'Federico II, ' Complesso Universitario di Monte, Sant’Angelo, Via, Cinthia, 80126, Napoli, Italy2 Istituto Nazionale di Fisica, Nucleare, Sezione di, Napoli, Complesso Universitario di Monte, Sant’Angelo, Italy3 Dipartimento di Matematica e., Fisica 'Ennio De Giorgi, ' Universit`a del, Salento, via per, Arnesano, 73100, Lecce, Italy4 Istituto Nazionale di Fisica, Nucleare, Sezione di, Lecce, Italy5 Key Laboratory of Particle, Astrophysic, Institute of High Energy, Physic, Chinese Academy of, Science, P. O., Box 918, 100049, Beijing, China6 Dipartimento di Fisica Nucleare e., Teorica dell’Universit`a di Pavia, via Bassi, 6, 27100, Pavia, Italy7 Istituto Nazionale di Fisica, Nucleare, Sezione di, Pavia, Italy8 Istituto Nazionale di Fisica, Nucleare, Sezione di Roma, Tre, via della Vasca Navale, 84, 00146, Roma, Italy9 Istituto Nazionale di Fisica Nucleare, Cnaf, Viale Berti Pichat, 6/2, 40127, Bologna, Italy10 Dipartimento di Fisica dell’Universit`a di Roma 'Tor, Vergata, ' via della Ricerca Scientifica, 1, 00133, Roma, Italy11 Istituto Nazionale di Fisica, Nucleare, Sezione di Roma Tor, Vergata, via della Ricerca Scientifica, 1, Italy12 Tibet, University, 850000, Lhasa, Xizang, China13 Hebei Normal, University, Shijiazhuang, 050016, Hebei, China14 Yunnan, University, 2 North Cuihu, R. d., 650091, Kunming, Yunnan, China15 Dipartimento di, Fisica, Universit`a degli Studi di, Palermo, Viale delle, Scienze, Edificio, 18, 90128, Palermo, Italy16 Istituto Nazionale di Fisica, Nucleare, Sezione di, Catania, Viale A., Doria 6, 95125, Catania, Italy17 Osservatorio Astrofisico di Torino dell’Istituto Nazionale di, Astrofisica, corso Fiume, 4, 10133, Torino, Italy18 Istituto Nazionale di Fisica, Nucleare, Sezione di, Torino, via P., Giuria 1, 10125, Torino, Italy19 Dipartimento di Fisica dell’Universit`a di, Torino, Italy20 Shandong, University, 250100, Jinan, Shandong, China21 Southwest Jiaotong, University, 610031, Chengdu, Sichuan, China22 Dipartimento di Fisica dell’Universit`a 'Roma, Tre, ' via della Vasca Navale, 84, Italy23 Istituto di Astrofisica Spaziale e., Fisica Cosmica dell’Istituto Nazionale di Astrofisica, via La Malfa, 153, 90146, Palermo, Italy, B., Bartoli, Bernardini, Paolo, C., Bleve, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, C., Cattaneo, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D’Alì Staiti, M., Dattoli, DE MITRI, Ivan, B., D’Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, F., Galeazzi, E., Giroletti, Q. B., Gou, Y. Q., Guo, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, F., Ruggieri, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, and G., Zizzi
Subjects: Astrophysics::High Energy Astrophysical Phenomena, Astrophysics, general – pulsars: individual (MGRO J1908+06) [gamma rays], 7. Clean energy, 01 natural sciences, Pulsar wind nebula, Luminosity, Settore FIS/05 - Astronomia E Astrofisica, Pulsar, 0103 physical sciences, 010303 astronomy & astrophysics, pulsar, Physics, 010308 nuclear & particles physics, gamma rays: general – pulsars: individual (MGRO J1908+06), Settore FIS/01 - Fisica Sperimentale, Gamma ray, Astronomy and Astrophysics, (MGRO J1908+06), Air shower, Crab Nebula, 13. Climate action, Space and Planetary Science, gamma ray, Milagro, High Energy Physics::Experiment, Astrophysics - High Energy Astrophysical Phenomena, Energy (signal processing)
Abstract: The extended gamma ray source MGRO J1908+06, discovered by the Milagro air shower detector in 2007, has been observed for about 4 years by the ARGO-YBJ experiment at TeV energies, with a statistical significance of 6.2 standard deviations. The peak of the signal is found at a position consistent with the pulsar PSR J1907+0602. Parametrizing the source shape with a two-dimensional Gauss function we estimate an extension \sigma = 0.49 \pm 0.22 degrees, consistent with a previous measurement by the Cherenkov Array H.E.S.S.. The observed energy spectrum is dN/dE = 6.1 \pm 1.4 \times 10^-13 (E/4 TeV)^{-2.54 \pm 0.36} photons cm^-2 s^-1 TeV^-1, in the energy range 1-20 TeV. The measured gamma ray flux is consistent with the results of the Milagro detector, but is 2-3 times larger than the flux previously derived by H.E.S.S. at energies of a few TeV. The continuity of the Milagro and ARGO-YBJ observations and the stable excess rate observed by ARGO-YBJ along 4 years of data taking support the identification of MGRO J1908+06 as the steady powerful TeV pulsar wind nebula of PSR J1907+0602, with an integrated luminosity above 1 TeV about 1.8 times the Crab Nebula luminosity., Comment: 6 pages, accepted for pubblication by ApJ. Replaced to correct the author list
Published: 2012

2. Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment

Author: Carla Bleve, Q. Q. Zhu, B. S. Wang, Zhaxisangzhu, Hongbo Hu, C. F. Feng, B. Bartoli, Carlo Vigorito, S. M. Mari, A. F. Yuan, X. D. Sheng, Zhengguo Cao, Paolo Montini, T. Di Girolamo, G. Liguori, B. D'Ettorre Piazzoli, R. Iuppa, L. L. Ma, Haibing Hu, Jilong Zhang, Y. Q. Guo, E. Giroletti, Y. B. Chen, H. J. Li, Chang-Chun Ning, Zhaoyang Feng, H. R. Wu, F. Ruggieri, Y. Zhang, P. Bernardini, S. W. Cui, D. Martello, B. Panico, Labaciren, Jianli Zhang, L. Xue, M. Iacovacci, M. Zha, M. Y. Liu, P. R. Shen, X. Y. Zhang, B. Z. Dai, J. K. K. Liu, Antonio Budano, P. Pistilli, H. M. Zhang, X. X. Zhou, C. Cattaneo, H. Y. Jia, X. H. Ding, Hong-peng Lu, Q. Y. Yang, Zhaxiciren, P. Creti, A. K. Calabrese Melcarne, P. F. Zhang, Cristian Stanescu, P. Branchini, A. Surdo, Roberto Cardarelli, Danzengluobu, G. Zizzi, Q. Huang, X. J. Bi, G. Marsella, Zhenyong Feng, F. R. Zhu, S. Vernetto, C. Liu, Bingwei Xu, X. X. Li, S. Catalanotti, Paolo Camarri, Z. G. Yao, H.H. He, M. Dattoli, M. Panareo, Huaguang Wang, Y. H. Tan, X. H. Ma, Q. B. Gou, I. De Mitri, J. B. Zhao, P. Salvini, Fudong Shi, A. Pagliaro, S. Mastroianni, J. Y. Li, T. L. Chen, I. Bolognino, S. Z. Chen, Giovanni Mancarella, G. Di Sciascio, X. C. Yang, R. Santonico, Irina James, L. Perrone, F. Galeazzi, Longzhou Zhang, C. Y. Wu, C. Q. Liu, G. D'Alí Staiti, P. Vallania, B., Bartoli, Bernardini, Paolo, X. J., Bi, C., Bleve, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, C., Cattaneo, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D'Alí Staiti, Danzengluobu, M., Dattoli, DE MITRI, Ivan, B., D'Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, F., Galeazzi, E., Giroletti, Q. B., Gou, Y. Q., Guo, H. H., He, Haibing, Hu, Hongbo, Hu, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, Labaciren, H. J., Li, J. Y., Li, X. X., Li, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, L. L., Ma, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, F., Ruggieri, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, J., Zhao, Zhaxiciren, Zhaxisangzhu, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, Bartoli, Bruno, Bernardini, P., Bleve, C., Bolognino, I., Branchini, P., Budano, A., A. K. C., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, Sergio, Cattaneo, C., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., Staiti, G. D., Dattoli, M., Mitri, I. D., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Ding, X. H., Sciascio, G. D., Feng, C. F., Feng, Z. Y., Galeazzi, F., Giroletti, E., Gou, Q. B., Guo, Y. Q., H. B., Hu, Huang, Q., Iacovacci, Michele, Iuppa, R., James, I., Jia, H. Y., Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., Xu, B., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, J. L., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhao, J., Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cardarelli, R, Catalanotti, S, Cattaneo, C, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui, SW, Dai, BZ, D’Ali Staiti, G, Dattoli, M, De Mitri, I, D’Ettorre Piazzoli, B, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Li, HJ, Li, JY, Li, XX, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, LL, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Ruggieri, F, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, M. Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhao, J, Zhaxiciren, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, Bartoli, B., Bi, X. J., Melcarne A. K., Calabrese, Catalanotti, S., Staiti G., D'Ali, De Mitri, I., Piazzoli B., D'Ettorre, Di Girolamo, T., Di Sciascio, G., Feng, Zhaoyang, Feng, Zhenyong, He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Li, H. J., Li, J. Y., Li, X. X., Ma, L. L., Ma, X. H., Mari, Stefano Maria, Wu, C. Y., Wu, H. R., Zhang, Jilong, and Zhang, Jianli
Subjects: Astrophysics::High Energy Astrophysical Phenomena, general – pulsars: individual (MGRO J2019+37 [Gamma rays], Flux, FOS: Physical sciences, Astrophysics, 01 natural sciences, Pulsar wind nebula, general – pulsar, 0103 physical sciences, MILAGRO, 010303 astronomy & astrophysics, DETECTOR, Argo, Physics, CALIBRATION, High Energy Astrophysical Phenomena (astro-ph.HE), 010308 nuclear & particles physics, MGRO J2031+41), Settore FIS/01 - Fisica Sperimentale, Gamma ray, Astronomy and Astrophysics, individual (MGRO J2019+37, MGRO J2031+41), PLANE, 3. Good health, Medium energy, Crab Nebula, gamma ray, 13. Climate action, Space and Planetary Science, GALACTIC SOURCES, J2032+4130, Milagro, gamma rays, general – pulsars, EMISSION, Astrophysics - High Energy Astrophysical Phenomena
Abstract: We report the observation of TeV gamma-rays from the Cygnus region using the ARGO-YBJ data collected from 2007 November to 2011 August. Several TeV sources are located in this region including the two bright extended MGRO J2019+37 and MGRO J2031+41. According to the Milagro data set, at 20 TeV MGRO J2019+37 is the most significant source apart from the Crab Nebula. No signal from MGRO J2019+37 is detected by the ARGO-YBJ experiment, and the derived flux upper limits at 90% confidence level for all the events above 600 GeV with medium energy of 3 TeV are lower than the Milagro flux, implying that the source might be variable and hard to be identified as a pulsar wind nebula. The only statistically significant (6.4 standard deviations) gamma-ray signal is found from MGRO J2031+41, with a flux consistent with the measurement by Milagro., 14 pages, 4 figures
Published: 2012

3. Measurement of the cosmic ray antiproton/proton flux ratio at TeV energies with the ARGO-YBJ detector

Author: X. X. Li, I. De Mitri, M. Iacovacci, M. Zha, G. D'Alí Staiti, Zhenyong Feng, P. Vallania, S. Vernetto, C. Cattaneo, F. R. Zhu, C. Liu, T. L. Chen, X. H. Ma, H.H. He, S. W. Cui, Jilong Zhang, F. Ruggieri, Q. Q. Zhu, P. Bernardini, S. Catalanotti, M. Panareo, Giovanni Mancarella, T. Di Girolamo, B. D'Ettorre Piazzoli, Y. Q. Guo, Carla Bleve, C. Y. Wu, E. Giroletti, B. Panico, P. Salvini, Zhaxiciren, R. Santonico, Zihuang Cao, Y. B. Chen, H. J. Li, Paolo Camarri, C. Q. Liu, H. R. Wu, Hongbo Hu, L. Xue, C. F. Feng, A. K. Calabrese Melcarne, A. F. Yuan, Carlo Vigorito, B. Z. Dai, Paolo Montini, R. Iuppa, B. Bartoli, Hong-peng Lu, X. Y. Zhang, X. C. Yang, G. Marsella, Haibing Hu, Cristian Stanescu, P. Branchini, Y. X. Yan, Antonio Budano, B. S. Wang, J. K. K. Liu, Zhaxisangzhu, Labaciren, Irina James, Y. Zhang, Chang-Chun Ning, Zhaoyang Feng, D. Martello, Longzhou Zhang, L. Perrone, Jianli Zhang, P. Creti, P. Pistilli, H. M. Zhang, X. X. Zhou, Z. G. Yao, Bingwei Xu, A. Surdo, Q. Huang, Huaguang Wang, G. Liguori, Fudong Shi, S. Mastroianni, Q. B. Gou, X. D. Sheng, P. R. Shen, P. F. Zhang, X. J. Bi, S. Z. Chen, S. M. Mari, X. B. Qu, X. H. Ding, Roberto Cardarelli, G. Di Sciascio, Y. H. Tan, J. Y. Li, M. Y. Liu, Q. Y. Yang, H. Y. Jia, Danzengluobu, G. Zizzi, I. Bolognino, A. Pagliaro, Bartoli, B., Bernardini, P., Bi, X. J., Bleve, C., Bolognino, I., Branchini, P., Budano, A., Melcarne A. K., Calabrese, Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, S., Cattaneo, C., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., Staiti G., D'Ali, Danzengluobu, De Mitri, I., Piazzoli B., D'Ettorre, Di Girolamo, T., Ding, X. H., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Giroletti, E., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Huang, Q., Iacovacci, M., Iuppa, R., James, I., Jia, H. Y., Labaciren, Li, H. J., Li, J. Y., Li, X. X., Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., Ma, X. H., Mancarella, G., Mari, Stefano Maria, Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Qu, X. B., Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., Wu, C. Y., Wu, H. R., Xu, B., Xue, L., Yan, Y. X., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., Bartoli, Bruno, Bi, X., Calabrese Melcarne, A., Catalanotti, Sergio, Chen, S., Chen, T., Cui, S., Dai, B., D’Alí Staiti, G., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Ding, X., Feng, C., Zhaoyang, Feng, Zhenyong, Feng, Gou, Q., Guo, Y., He, H., Haibing, Hu, Hongbo, Hu, Iacovacci, Michele, Jia, H., Li, H., Li, J., Li, X., Liu, M., Ma, X., Mari, S., Ning, C., Qu, X., Shen, P., Sheng, X., Tan, Y., Wu, C., Wu, H., Yan, Y., Yang, Q., Yang, X., Yao, Z., Yuan, A., Zhang, H., Jilong, Zhang, Jianli, Zhang, Zhang, X., Zhou, X., Zhu, F., Zhu, Q., Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cardarelli, R, Catalanotti, S, Cattaneo, C, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui, SW, Dai, BZ, D’Ali' Staiti, G, De Mitri, I, D’Ettorre Piazzoli, B, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HBa, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Li, HJ, Li, JY, Li, XX, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Qu, XB, Ruggieri, F, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLo, Zhang, JLi, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhaxiciren, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, B., Bartoli, Bernardini, Paolo, X. J., Bi, C., Bleve, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, C., Cattaneo, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D’Alí Staiti, DE MITRI, Ivan, B., D’Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, E., Giroletti, Q. B., Gou, Y. Q., Guo, H. H., He, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, H. J., Li, J. Y., Li, X. X., Li, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, X. B., Qu, F., Ruggieri, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, and G., Zizzi
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, Settore FIS/01 - Fisica Sperimentale, Earth-Moon, Cosmic ray, magnetic spectrometer, High Energy Physics - Experiment, Nuclear physics, Earth's magnetic field, Antiproton, Antimatter, antiproton, Content (measure theory), Antiproton-Proton ratio, Cosmic rays, Extended Air Showers, Astrophysics - High Energy Astrophysical Phenomena, Energy (signal processing)
Abstract: Cosmic ray antiprotons provide an important probe to study the cosmic ray propagation in the interstellar space and to investigate the existence of dark matter. Acting the Earth-Moon system as a magnetic spectrometer, paths of primary antiprotons are deflected in the opposite sense with respect to those of the protons in their way to the Earth. This effect allows, in principle, the search for antiparticles in the direction opposite to the observed deficit of cosmic rays due to the Moon (the so-called `Moon shadow'). The ARGO-YBJ experiment, located at the Yangbajing Cosmic Ray Laboratory (Tibet, P.R. China, 4300 m a.s.l., 606 g/cm$^2$), is particularly effective in measuring the cosmic ray antimatter content via the observation of the cosmic rays shadowing effect due to: (1) good angular resolution, pointing accuracy and long-term stability; (2) low energy threshold; (3) real sensitivity to the geomagnetic field. Based on all the data recorded during the period from July 2006 through November 2009 and on a full Monte Carlo simulation, we searched for the existence of the shadow cast by antiprotons in the TeV energy region. No evidence of the existence of antiprotons is found in this energy region. Upper limits to the $\bar{p}/p$ flux ratio are set to 5 % at a median energy of 1.4 TeV and 6 % at 5 TeV with a confidence level of 90%. In the TeV energy range these limits are the lowest available., Comment: Contact authors: G. Di Sciascio (disciascio@roma2.infn.it) and R. Iuppa (iuppa@roma2.infn.it), INFN Sezione di Roma Tor Vergata, Roma, Italy
Published: 2012

4. Light-component spectrum of the primary cosmic rays in the multi-TeV region measured by the ARGO-YBJ experiment

Author: X. C. Yang, B. Bartoli, Zhenyong Feng, B. Panico, C. Liu, P. R. Shen, Irina James, X. H. Ma, J. K. K. Liu, P. Salvini, G. D'Alí Staiti, P. Vallania, Q. Q. Zhu, P. Pistilli, H. M. Zhang, X. X. Zhou, Giovanni Mancarella, G. Di Sciascio, B. D'Ettorre Piazzoli, P. Creti, R. Santonico, X. X. Li, Y. B. Chen, H. J. Li, Carla Bleve, H. R. Wu, Hongbo Hu, H. Y. Jia, L. Xue, C. F. Feng, Bingwei Xu, C. Y. Wu, A. Surdo, L. Perrone, Hong-peng Lu, C. Q. Liu, Chang-Chun Ning, Zhaoyang Feng, Q. Huang, I. De Mitri, Q. B. Gou, X. Y. Zhang, T. Di Girolamo, Paolo Camarri, T. L. Chen, M. Iacovacci, B. Z. Dai, X. X. Yan, F. R. Zhu, P. F. Zhang, X. J. Bi, Y. Q. Guo, S. Catalanotti, S. W. Cui, S. Z. Chen, Jianli Zhang, P. Bernardini, F. Ruggieri, Cristian Stanescu, P. Branchini, M. Panareo, Zihuang Cao, A. F. Yuan, Carlo Vigorito, B. S. Wang, Longzhou Zhang, Zhaxisangzhu, Haibing Hu, E. Giroletti, Z. G. Yao, S. M. Mari, Antonio Budano, Y. Zhang, Labaciren, D. Martello, M. Zha, C. Cattaneo, A. K. Calabrese Melcarne, Paolo Montini, G. Marsella, R. Iuppa, S. Vernetto, Danzengluobu, X. D. Sheng, J. Y. Li, H.H. He, M. Dattoli, I. Bolognino, M. Y. Liu, Q. Y. Yang, G. Zizzi, X. B. Qu, X. H. Ding, Roberto Cardarelli, Y. H. Tan, A. Pagliaro, G. Liguori, Huaguang Wang, Fudong Shi, S. Mastroianni, Zhaxiciren, Jilong Zhang, Bartoli, B., Bernardini, P., Bi, X. J., Bleve, C., Bolognino, I., Branchini, P., Budano, A., Calabrese Melcarne, A. K., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, S., Cattaneo, C., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., D'Ali Staiti, G., Danzengluobu, Dattoli, M., De Mitri, I., D'Ettorre Piazzoli, B., Di Girolamo, T., Ding, X. H., Di Sciascio, G., Feng, C. F., Feng, Z., Giroletti, E., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, H., Huang, Q., Iacovacci, M., Iuppa, R., James, I., Jia, H. Y., Labaciren, Li, H. J., Li, J. Y., Li, X. X., Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Qu, X. B., Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., Wu, C. Y., Wu, H. R., Xu, B., Xue, L., Yan, X. X., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, J., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., Bartoli, B, Bernardini, P, Bi, Xj, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Melcarne, Akc, Camarri, P, Cao, Z, Cardarelli, R, Catalanotti, S, Cattaneo, C, Chen, Sz, Chen, Tl, Chen, Y, Creti, P, Cui, Sw, Dai, Bz, Staiti, Gd, Dattoli, M, De Mitri, I, Piazzoli, Bd, Di Girolamo, T, Ding, Xh, Di Sciascio, G, Feng, Cf, Feng, Zy, Giroletti, E, Gou, Qb, Guo, Yq, He, Hh, Hu, Hb, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, Hy, Li, Hj, Li, Jy, Li, Xx, Liguori, G, Liu, C, Liu, Cq, Liu, J, Liu, My, Lu, H, Ma, Xh, Mancarella, G, Mari, Stefano Maria, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, Cc, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Qu, Xb, Ruggieri, F, Salvini, P, Santonico, R, Shen, Pr, Sheng, Xd, Shi, F, Stanescu, C, Surdo, A, Tan, Yh, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, Cy, Wu, Hr, Xu, B, Xue, L, Yan, Xx, Yang, Qy, Yang, Xc, Yao, Zg, Yuan, Af, Zha, M, Zhang, Hm, Zhang, Jl, Zhang, L, Zhang, P, Zhang, Xy, Zhang, Y, Zhou, Xx, Zhu, Fr, Zhu, Qq, Bartoli, Bruno, X. J., Bi, A. K. C., Catalanotti, Sergio, Staiti, G. D., Mitri, I. D., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Sciascio, G. D., Feng, Z. Y., H. H., He, H. B., Hu, Iacovacci, Michele, H. J., Li, J. Y., Li, X. X., Li, X. H., Ma, X. B., Qu, C. Y., Wu, H. R., Wu, Zhang, J. L., B., Bartoli, Bernardini, Paolo, C., Bleve, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, C., Cattaneo, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D’Alı´ Staiti, M., Dattoli, DE MITRI, Ivan, B., D’Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, E., Giroletti, Q. B., Gou, Y. Q., Guo, Haibing, Hu, Hongbo, Hu, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, F., Ruggieri, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, B., Xu, L., Xue, X. X., Yan, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, Bi, XJ, Calabrese Melcarne, AK, Chen, SZ, Chen, TL, Cui, SW, Dai, BZ, D'ALI'STAITI, G, D’Ettorre Piazzoli, B, Ding, XH, Feng, CF, Feng, ZYa, Feng, ZYo, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, James, J, Jia, HY, Li, HJ, Li, JY, Li, XX, Liu, CQ, Liu, MY, Ma, XH, Mari, S, Ning, CC, Panareo, P, Qu, XB, Shen, PR, Sheng, XD, Tan, YH, Wu, CY, Wu, HR, Yan, XX, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, XY, Zhou, XX, Zhu, FR, Zhu, QQ, and Zizzi, G
Subjects: Extended Air Showers, Cosmic Rays, Gamma Ray sources, Nuclear and High Energy Physics, Proton, TIBET, Astrophysics::High Energy Astrophysical Phenomena, Extensive air shower, chemistry.chemical_element, Cosmic ray, HELIUM SPECTRA, Astrophysics, PROTON, Bayesian method, CASCADES, Spectral line, Settore FIS/05 - Astronomia E Astrofisica, Nuclear magnetic resonance, Cosmic-ray observatory, Helium, Physics, Range (particle radiation), ENERGY-RANGE, BALLOON EXPERIMENT, NUCLEI, Settore FIS/01 - Fisica Sperimentale, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, light component spectrum, chemistry, Energy (signal processing), SYSTEM
Abstract: The ARGO-YBJ experiment detects extensive air showers in a wide energy range by means of a full-coverage detector which is in stable data taking in its full configuration since November 2007 at the YBJ International Cosmic Ray Observatory (4300 m a.s.l., Tibet, People's Republic of China). In this paper the measurement of the light-component spectrum of primary cosmic rays in the energy region $(5\textdiv{}200)\text{ }\text{ }\mathrm{TeV}$ is reported. The method exploited to analyze the experimental data is based on a Bayesian procedure. The measured intensities of the light component are consistent with the recent CREAM results and higher than that obtained adding the proton and helium spectra reported by the RUNJOB experiment.
Published: 2012

5. Calibration of the RPC charge readout in the ARGO-YBJ experiment

Author: M. Iacovacci, M. Zha, Hongbo Hu, C. Liu, A. Surdo, Y. B. Chen, Q. Y. Yang, Yicheng Guo, Y. X. Yan, Danzengluobu, X. H. Ma, P. Creti, B. Liberti, A. F. Yuan, Huihai He, G. Zizzi, P. F. Zhang, Haifeng Li, Paolo Bernardini, R. Santonico, X. C. Yang, X. J. Bi, X. Y. Zhang, R. Gargana, Minghui Liu, S. Z. Chen, X. X. Li, Labaciren, L. Zhang, A. Pagliaro, C. Cattaneo, F. Shi, A. Cappa, Irina James, Piero Vallania, X. B. Qu, S. Catalanotti, X. H. Ding, B. S. Wang, Zhaxisangzhu, P. Salvini, L. Perrone, G. Di Sciascio, A. K. Calabrese Melcarne, Jilong Zhang, Y. H. Tan, M. De Vincenzi, R. Cardarelli, S. M. Mari, Cunfeng Feng, G. D'Alí Staiti, E. Rossi, N. Cheng, Jianli Zhang, Paolo Montini, R. Iuppa, H. Y. Jia, S. Vernetto, C. Bacci, P. Camarri, G. Mancarella, J. K. K. Liu, C. Y. Wu, L. Saggese, Zihuang Cao, I. De Mitri, T. L. Chen, H. M. Zhang, M. Dattoli, H. Lu, G. Liguori, C. X. Liu, F. Galeazzi, B. Bartoli, T. Di Girolamo, P. Celio, G. Aielli, B. D'Ettorre Piazzoli, Bingwei Xu, Severino Angelo Maria Bussino, P. R. Shen, L. Xue, Q. B. Gou, Carlo Vigorito, Xiangdong Sheng, P. Pistilli, X. X. Zhou, P. Galeotti, Q. Huang, Haibing Hu, C. Bleve, Y. Zhang, D. Martello, Zhenyong Feng, A. Budano, S. Mastroianni, H. R. Wu, H. W. Wang, B. Z. Dai, F. Ruggieri, F. R. Zhu, M. Panareo, Q. Q. Zhu, P. Branchini, G. Marsella, X. R. Meng, C. Stanescu, Chang-Chun Ning, Zhaoyang Feng, S. W. Cui, J. Y. Li, Bartoli, Bruno, Catalanotti, Sergio, D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Iacovacci, Michele, Aielli, G, Bacci, C, Bartoli, B, Bernardini, P, Bi, Xj, Bleve, C, Branchini, P, Budano, A, Bussino, Severino Angelo Maria, Calabrese Melcarne, Ak, Camarri, P, Cao, Z, Cappa, A, Cardarelli, R, Catalanotti, S, Cattaneo, C, Celio, P, Chen, Sz, Chen, Tl, Chen, Y, Cheng, N, Creti, P, Cui, Sw, Dai, Bz, D'Ali Staiti, G, Danzengluobu, Dattoli, M, De Mitri, I, D'Ettorre Piazzoli, B, DE VINCENZI, Mario, Di Girolamo, T, Ding, Xh, Di Sciascio, G, Feng, Cf, Feng Zhao, Yang, Feng Zhen, Yong, Galeazzi, F, Galeotti, P, Gargana, R, Gou, Qb, Guo, Yq, He, Hh, Hu, Haibing, Hu Hong, Bo, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, Hy, Labaciren, Li, Hj, Li, Jy, Li, Xx, Liberti, B, Liguori, G, Liu, C, Liu, Cq, Liu, My, Liu, J, Lu, H, Ma, Xh, Mancarella, G, Mari, Stefano Maria, Marsella, G, Martello, D, Mastroianni, S, Meng, Xr, Montini, P, Ning, Cc, Pagliaro, A, Panareo, M, Perrone, L, Pistilli, P, Qu, Xb, Rossi, E, Ruggieri, F, Saggese, L, Salvini, P, Santonico, R, Shen, Pr, Sheng, Xd, Shi, F, Stanescu, C, Surdo, A, Tan, Yh, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, Cy, Wu, Hr, Xu, B, Xue, L, Yan, Yx, Yang, Qy, Yang, Xc, Yuan, Af, Zha, M, Zhang, Hm, Zhang Ji, Long, Zhang Jian, Li, Zhang, L, Zhang, P, Zhang, Xy, Zhang, Y, Zhaxisangzhu, Zhou, Xx, Zhu, Fr, Zhu, Qq, Zizzi, G., Bi, XJ, Bussino, S, Calabrese Melcarne, AK, Chen, SZ, Chen, TL, Cui, SW, Dai, BZ, De Vincenzi, M, Ding, XH, Feng, CF, Feng, ZYa, Feng, ZYo, Gou, QB, Guo, YQ, He, HH, Hu, HaB, Hu, HoB, Jia, HY, Li, HJ, Li, JY, Li, XX, Liu, CQ, Liu, MY, Ma, XH, Mari, SM, Meng, XR, Ning, CC, Qu XB, Shen, PR, Sheng, XD, Tan, YH, Wu, CY, Wu, HR, Yan, YX, Yang, QY, Yang, XC, Yuan, AF, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, XY, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, G., Aielli, C., Bacci, B., Bartoli, Bernardini, Paolo, X. J., Bi, C., Bleve, P., Branchini, A., Budano, S., Bussino, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, A., Cappa, R., Cardarelli, S., Catalanotti, C., Cattaneo, P., Celio, S. Z., Chen, T. L., Chen, Y., Chen, N., Cheng, P., Creti, S. W., Cui, B. Z., Dai, G., D’Alı´ Staiti, M., Dattoli, DE MITRI, Ivan, B., D’Ettorre Piazzoli, M., De Vincenzi, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, F., Galeazzi, P., Galeotti, R., Gargana, Q. B., Gou, Y. Q., Guo, H. H., He, Haibing, Hu, Hongbo, Hu, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, H. J., Li, J. Y., Li, X. X., Li, B., Liberti, G., Liguori, C., Liu, C. Q., Liu, M. Y., Liu, J., Liu, H., Lu, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, X. R., Meng, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, Perrone, Lorenzo, P., Pistilli, X. B., Qu, E., Rossi, F., Ruggieri, L., Saggese, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, A. F., Yuan, M., Zha, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, and G., Zizzi
Subjects: Optical telescopes, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Camere a Piastre Resistive (RPC), Resistive plate chamber, Astrophysics::High Energy Astrophysical Phenomena, Cosmic ray, law.invention, Telescope, Settore FIS/05 - Astronomia E Astrofisica, Optics, law, Coincident, Air showers, Calibration, Sea level, Instrumentation, Particle densities, Cosmic rays, Resistive Plate Chambers, Charge read-out, Extended Air Showers, Physics, Air showers, Charge readout, Dynamic range, Knee regions, Particle densities, Resistive plate chambers, Calibration, Charged particles, Cosmic rays, Experiments, Optical telescopes, Sea level, Telescopes, Particle spectrometers, Resistive touchscreen, Scintillation, Dynamic range, Charge readout, business.industry, Charged particles, Settore FIS/01 - Fisica Sperimentale, Astrophysics::Instrumentation and Methods for Astrophysics, Charged particle, Air shower, Calibrazione della Risposta Analogica di RPC, Knee regions, Lettura Analogica di RPC, Resistive plate chambers, business, Experiments, Telescopes
Abstract: ""The charge readout of Resistive Plate Chambers (RPCs) is implemented in the ARGO-YBJ experiment to measure the charged particle density of the shower front up to 10^4\\\/m^2, enabling the study of the primary cosmic rays with energies in the ''knee'' region. As the first time for RPCs being used this way, a telescope with RPCs and scintillation detectors is setup to calibrate the number of charged particles hitting a RPC versus its charge readout. Air shower particles are taken as the calibration beam. The telescope was tested at sea level and then moved to the ARGO-YBJ site for coincident operation with the ARGO-YBJ experiment. The charge readout shows good linearity with the particle density in the dynamic range (up to 200\\\/m^2).""
Published: 2012

6. Long-term monitoring of the TeV emission from Mrk 421 with the ARGO-YBJ experiment

Author: Collaboration, The ARGO-YBJ, Bartoli, B., Bernardini, P., Bi, X. J., Bleve, C., Bolognino, I., Branchini, P., Budano, A., Melcarne, A. K. Calabrese, Camarri, P., Cao, Z., Cappa, A., Cardarelli, R., Catalanotti, S., Cattaneo, C., Celio, P., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., Staiti, G. D'Alí, Danzengluobu, Dattoli, M., De Mitri, I., Piazzoli, B. D'Ettorre, Di Girolamo, T., Ding, X. H., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Galeazzi, F., Galeotti, P., Giroletti, E., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Huang, Q., Iacovacci, M., Iuppa, R., James, I., Jia, H. Y., Labaciren, Li, H. J., Li, J. Y., Li, X. X., Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Qu, X. B., Rossi, E., Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., Wu, C. Y., Wu, H. R., Xu, B., Xue, L., Yan, Y. X., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., Bartoli, Bruno, Catalanotti, Sergio, D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Iacovacci, Michele, Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cappa, A, Cardarelli, R, Catalanotti, S, Cattaneo, C, Celio, P, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui SW, Dai, BZ, D'Alí Staiti, G, Danzengluobu, Dattoli, M, De Mitri, I, D'Ettorre Piazzoli, B, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng CF, Feng, XYa, Feng, ZYo, Galeazzi, F, Galeotti, P, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Labaciren, Li, HJ, Li, JY, Li, XX, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Qu, XB, Rossi, E, Ruggieri, F, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLo, Zhang,JLi, Zhang,L, Zhang, P, Zhang, XY, Zhang, Y, Zhaxiciren, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, Bi, Xj, Melcarne, Akc, Chen, Sz, Chen, Tl, Cui, Sw, Dai, Bz, Staiti, Gd, Piazzoli, Bd, Ding, Xh, Feng, Cf, Feng, Zy, Gou, Qb, Guo, Yq, He, Hh, Hu, Hb, Jia, Hy, Li, Hj, Li, Jy, Li, Xx, Liu, Cq, Liu, My, Ma, Xh, Mari, Stefano Maria, Ning, Cc, Qu, Xb, Shen, Pr, Sheng, Xd, Tan, Yh, Wu, Cy, Wu, Hr, Yan, Yx, Yang, Qy, Yang, Xc, Yao, Zg, Yuan, Af, Zhang, Hm, Zhang, Jl, Zhang, L, Zhang, Xy, Zhaxiciren, Zhaxisangzhu, Zhou, Xx, Zhu, Fr, Zhu, Qq, and Zizzi, G.
Subjects: media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, Oggetti di tipo BL Lacertae, FOS: Physical sciences, Flux, Astrophysics, 01 natural sciences, 7. Clean energy, individual (Markarian 421) [BL Lacertae objects], Spectral line, Gamma-rays, Markarian 421, BL Lacertae, Resistive Plate Chambers, law.invention, law, 0103 physical sciences, Radiative transfer, 010303 astronomy & astrophysics, media_common, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Markarian 421, Settore FIS/01 - Fisica Sperimentale, Astronomy and Astrophysics, general [gamma ray], Synchrotron, 3. Good health, Air shower, 13. Climate action, Space and Planetary Science, Duty cycle, Sky, Raggi gamma, Spectral energy distribution, Astrophysics - High Energy Astrophysical Phenomena
Abstract: ARGO-YBJ is an air shower detector array with a fully covered layer of resistive plate chambers. It is operated with a high duty cycle and a large field of view. It continuously monitors the northern sky at energies above 0.3 TeV. In this paper, we report a long-term monitoring of Mrk 421 over the period from 2007 November to 2010 February. This source was observed by the satellite-borne experiments Rossi X-ray Timing Explorer and Swift in the X-ray band. Mrk 421 was especially active in the first half of 2008. Many flares are observed in both X-ray and gamma-ray bands simultaneously. The gamma-ray flux observed by ARGO-YBJ has a clear correlation with the X-ray flux. No lag between the X-ray and gamma-ray photons longer than 1 day is found. The evolution of the spectral energy distribution is investigated by measuring spectral indices at four different flux levels. Hardening of the spectra is observed in both X-ray and gamma-ray bands. The gamma-ray flux increases quadratically with the simultaneously measured X-ray flux. All these observational results strongly favor the synchrotron self-Compton process as the underlying radiative mechanism., 30 pages, 8 figures
Published: 2011

7. Observation of the cosmic ray moon shadowing effect with the ARGO-YBJ experiment

Author: B. Bartoli, P. Bernardini, X. J. Bi, C. Bleve, I. Bolognino, P. Branchini, A. Budano, A. K. Calabrese Melcarne, P. Camarri, Z. Cao, R. Cardarelli, S. Catalanotti, C. Cattaneo, P. Celio, S. Z. Chen, T. L. Chen, Y. Chen, P. Creti, S. W. Cui, B. Z. Dai, G. D’Alí Staiti, null Danzengluobu, M. Dattoli, I. De Mitri, B. D’Ettorre Piazzoli, T. Di Girolamo, X. H. Ding, G. Di Sciascio, C. F. Feng, Zhaoyang Feng, Zhenyong Feng, F. Galeazzi, E. Giroletti, Q. B. Gou, Y. Q. Guo, H. H. He, Haibing Hu, Hongbo Hu, Q. Huang, M. Iacovacci, R. Iuppa, I. James, H. Y. Jia, null Labaciren, H. J. Li, J. Y. Li, X. X. Li, G. Liguori, C. Liu, C. Q. Liu, J. Liu, M. Y. Liu, H. Lu, X. H. Ma, G. Mancarella, S. M. Mari, G. Marsella, D. Martello, S. Mastroianni, P. Montini, C. C. Ning, A. Pagliaro, M. Panareo, B. Panico, L. Perrone, P. Pistilli, X. B. Qu, E. Rossi, F. Ruggieri, P. Salvini, R. Santonico, P. R. Shen, X. D. Sheng, F. Shi, C. Stanescu, A. Surdo, Y. H. Tan, P. Vallania, S. Vernetto, C. Vigorito, B. Wang, H. Wang, C. Y. Wu, H. R. Wu, B. Xu, L. Xue, Y. X. Yan, Q. Y. Yang, X. C. Yang, Z. G. Yao, A. F. Yuan, M. Zha, H. M. Zhang, Jilong Zhang, Jianli Zhang, L. Zhang, P. Zhang, X. Y. Zhang, Y. Zhang, null Zhaxiciren, null Zhaxisangzhu, X. X. Zhou, F. R. Zhu, Q. Q. Zhu, G. Zizzi, Bartoli, B, Bernardini, P, Bi, Xj, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Melcarne, Akc, Camarri, P, Cao, Z, Cardarelli, R, Catalanotti, S, Cattaneo, C, Celio, P, Chen, Sz, Chen, Tl, Chen, Y, Creti, P, Cui, Sw, Dai, Bz, Staiti, Gd, Danzengluobu, Dattoli, M, De Mitri, I, Piazzoli, Bd, Di Girolamo, T, Ding, Xh, Di Sciascio, G, Feng, Cf, Feng, Zy, Galeazzi, F, Giroletti, E, Gou, Qb, Guo, Yq, He, Hh, Hu, Hb, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, Hy, Labaciren, Li, Hj, Li, Jy, Li, Xx, Liguori, G, Liu, C, Liu, Cq, Liu, J, Liu, My, Lu, H, Ma, Xh, Mancarella, G, Mari, Stefano Maria, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, Cc, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Qu, Xb, Rossi, E, Ruggieri, F, Salvini, P, Santonico, R, Shen, Pr, Sheng, Xd, Shi, F, Stanescu, C, Surdo, A, Tan, Yh, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, Cy, Wu, Hr, Xu, B, Xue, L, Yan, Yx, Yang, Qy, Yang, Xc, Yao, Zg, Yuan, Af, Zha, M, Zhang, Hm, Zhang, Jl, Zhang, L, Zhang, P, Zhang, Xy, Zhang, Y, Zhaxiciren, Zhaxisangzhu, Zhou, Xx, Zhu, Fr, Zhu, Qq, Zizzi, G., Bartoli, Bruno, Catalanotti, Sergio, D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Iacovacci, Michele, B., Bartoli, Bernardini, Paolo, X. J., Bi, C., Bleve, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, C., Cattaneo, P., Celio, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D’Alı´ Staiti, M., Dattoli, DE MITRI, Ivan, B., D’Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, F., Galeazzi, E., Giroletti, Q. B., Gou, Y. Q., Guo, H. H., He, Haibing, Hu, Hongbo, Hu, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, H. J., Li, J. Y., Li, X. X., Li, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, X. B., Qu, E., Rossi, F., Ruggieri, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, D'Ali' Staiti, G, Bi, XJ, Calabrese Melcarne, AK, Chen, SZ, Chen, TL, Cui, SW, Dai, BZ, D’Alı Staiti, G, D’Ettorre Piazzoli, B, Ding, XH, Feng, CF, Feng, ZYa, Feng, ZYo, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, Jia, HY, Li, HJ, Li, JY, Li, XX, Liu, CQ, Liu, MY, Ma, XH, Mari, SM, Ning, CC, Qu, XB, Shen, PR, Sheng, XD, Tan, YH, Wu, CY, Wu, HR, Yan, YX, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, XY, Zhaxiciren, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, and Zizzi, G
Subjects: Point spread function, Nuclear and High Energy Physics, Cosmic Rays, Gamma Astronomy, Extended Air Showers, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Cosmic ray, Astrophysics, 01 natural sciences, Standard deviation, Physics::Geophysics, Raggi cosmici, Settore FIS/05 - Astronomia E Astrofisica, geomagnetic field, 0103 physical sciences, 010303 astronomy & astrophysics, Physics, 010308 nuclear & particles physics, Ombra della luna, Apparati di sciame, Detector, Settore FIS/01 - Fisica Sperimentale, Moon shadow, Astronomy, Magnetic field, Earth's magnetic field, Air shower, 13. Climate action, Physics::Space Physics
Abstract: Cosmic rays are hampered by the Moon and a deficit in its direction is expected (the so-called Moon shadow). The Moon shadow is an important tool to determine the performance of an air shower array. Indeed, the westward displacement of the shadow center, due to the bending effect of the geomagnetic field on the propagation of cosmic rays, allows the setting of the absolute rigidity scale of the primary particles inducing the showers recorded by the detector. In addition, the shape of the shadow permits to determine the detector point spread function, while the position of the deficit at high energies allows the evaluation of its absolute pointing accuracy. In this paper we present the observation of the cosmic ray Moon shadowing effect carried out by the ARGO-YBJ experiment in the multi-TeV energy region with high statistical significance (55 standard deviations). By means of an accurate Monte Carlo simulation of the cosmic rays propagation in the Earth-Moon system, we have studied separately the effect of the geomagnetic field and of the detector point spread function on the observed shadow. The angular resolution as a function of the particle multiplicity and the pointing accuracy have been obtained. The primary energy of detected showers has been estimated by measuring the westward displacement as a function of the particle multiplicity, thus calibrating the relation between shower size and cosmic ray energy. The stability of the detector on a monthly basis has been checked by monitoring the position and the deficit of the Moon shadow. Finally, we have studied with high statistical accuracy the shadowing effect in the day/’’night’’ time looking for possible effect induced by the solar wind.
Published: 2011

8. Mean Interplanetary Magnetic Field Measurement Using the ARGO-YBJ Experiment

Author: X. X. Li, Zhenyong Feng, L. Zhang, B. D'Ettorre Piazzoli, L. Xue, G. Mancarella, Q. B. Gou, A. Cappa, M. Zha, F. R. Zhu, M. Panareo, B. Z. Dai, M. Iacovacci, Piero Vallania, P. Creti, Danzengluobu, F. Ruggieri, A. K. Calabrese Melcarne, L. Perrone, P. Salvini, R. Cardarelli, G. Marsella, Q. Q. Zhu, Y. Q. Guo, P. Branchini, H. Y. Jia, G. Aielli, R. Santonico, H. H. He, C. Bacci, S. M. Mari, Zhengguo Cao, X. C. Yang, B. S. Wang, A. Pagliaro, Q. Y. Yang, Bingwei Xu, P. F. Zhang, E. Giroletti, Severino Angelo Maria Bussino, S. W. Cui, Hongbo Hu, A. Surdo, C. F. Feng, X. J. Bi, H. R. Wu, I. De Mitri, X. R. Meng, C. Stanescu, Irina James, A. F. Yuan, Chang-Chun Ning, Zhaoyang Feng, J. Y. Li, Jilong Zhang, T. Di Girolamo, F. Shi, Jianli Zhang, T. L. Chen, H. M. Zhang, G. Di Sciascio, Carlo Vigorito, P. Celio, C. Y. Wu, M. Y. Liu, M. De Vincenzi, Haibing Hu, R. Gargana, I. Bolognino, B. Bartoli, H. J. Li, X. D. Sheng, C. Bleve, Y. B. Chen, S. Z. Chen, L. Saggese, Y. Zhang, B. Liberti, Paolo Bernardini, D. Martello, X. B. Qu, X. H. Ding, Labaciren, J. K. K. Liu, P. Pistilli, X. X. Zhou, G. D'Alí Staiti, Y. H. Tan, P. Galeotti, Q. Huang, X. Y. Zhang, C. Liu, X. H. Ma, G. Liguori, C. X. Liu, Zhaxisangzhu, S. Catalanotti, Z. G. Yao, Y. X. Yan, E. Rossi, M. Dattoli, H. Lu, Paolo Montini, R. Iuppa, and G. Zizzi, P. Camarri, H. W. Wang, S. Vernetto, F. Galeazzi, A. Budano, S. Mastroianni, C. Cattaneo, P. R. Shen, Bartoli, Bruno, Catalanotti, Sergio, D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Iacovacci, Michele, Aielli, G, Bacci, C, Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Bussino, S, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cappa, A, Cardarelli, R, Catalanotti, S, Cattaneo, C, Celio, P, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui, SW, Dai, BZ, D'Ali Staiti, G, Danzengluobu, Dattoli, M, De Mitri, I, D'Ettorre Piazzoli, B, De Vincenzi, M, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Galeotti, P, Gargana, R, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HaB, Hu, HoB, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Labaciren, Li, HJ, Li, JY, Li, XX, Liberti, B, Liguori, G, Liu, C, Liu, CQ, Liu, MY, Liu, J, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Meng, XR, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Perrone, L, Pistilli, P, Qu XB, Rossi, E, Ruggieri, F, Saggese, L, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, G., Aielli, C., Bacci, B., Bartoli, Bernardini, Paolo, X. J., Bi, C., Bleve, I., Bolognino, P., Branchini, A., Budano, S., Bussino, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, A., Cappa, R., Cardarelli, S., Catalanotti, C., Cattaneo, P., Celio, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D'Alí Staiti, M., Dattoli, DE MITRI, Ivan, B., D'Ettorre Piazzoli, M., De Vincenzi, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, F., Galeazzi, P., Galeotti, R., Gargana, E., Giroletti, Q. B., Gou, Y. Q., Guo, H. H., He, Haibing, Hu, Hongbo, Hu, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, H. J., Li, J. Y., Li, X. X., Li, B., Liberti, G., Liguori, C., Liu, C. Q., Liu, M. Y., Liu, J., Liu, H., Lu, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, X. R., Meng, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, Perrone, Lorenzo, P., Pistilli, X. B., Qu, E., Rossi, F., Ruggieri, L., Saggese, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, Bi, Xj, Bussino, Severino Angelo Maria, Melcarne, Akc, Chen, Sz, Chen, Tl, Cui, Sw, Dai, Bz, Staiti, Gd, Piazzoli, Bd, DE VINCENZI, Mario, Ding, Xh, Feng, Cf, Feng, Zy, Gou, Qb, Guo, Yq, He, Hh, Hu, Hb, Jia, Hy, Li, Hj, Li, Jy, Li, Xx, Liu, Cq, Liu, My, Ma, Xh, Mari, Stefano Maria, Meng, Xr, Ning, Cc, Qu, Xb, Shen, Pr, Sheng, Xd, Tan, Yh, Wu, Cy, Wu, Hr, Yan, Yx, Yang, Qy, Yang, Xc, Yao, Zg, Yuan, Af, Zhang, Hm, Zhang, Jl, Zhang, Xy, Zhou, Xx, Zhu, Fr, Zhu, Qq, and Zizzi, G.
Subjects: Solar System, Field (physics), media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, magnetic field, Cosmic ray, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Settore FIS/05 - Astronomia E Astrofisica, Shadow, Astrophysics::Solar and Stellar Astrophysics, Interplanetary magnetic field, cosmic ray, Solar and Stellar Astrophysics (astro-ph.SR), media_common, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Settore FIS/01 - Fisica Sperimentale, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Cosmic Rays, Gamma Sources, Extended Air Showers, Solar wind, Magnetic field, Solar wind, Astrophysics - Solar and Stellar Astrophysics, solar wind, Space and Planetary Science, Sky, Physics::Space Physics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract: The sun blocks cosmic ray particles from outside the solar system, forming a detectable shadow in the sky map of cosmic rays detected by the ARGO-YBJ experiment in Tibet. Because the cosmic ray particles are positive charged, the magnetic field between the sun and the earth deflects them from straight trajectories and results in a shift of the shadow from the true location of the sun. Here we show that the shift measures the intensity of the field which is transported by the solar wind from the sun to the earth., Comment: 6 papges,3 figures
Published: 2011
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9. Early warning for VHE gamma-ray flares with the ARGO-YBJ detector

Author: Y. Q. Guo, B. D'Ettorre Piazzoli, Haibing Hu, H. J. Li, H. R. Wu, C. Bleve, Y. Zhang, L. Xue, X. B. Qu, D. Martello, C. Stanescu, Chang-Chun Ning, B. Bartoli, R. Santonico, Zhaoyang Feng, X. H. Ding, Hong-peng Lu, Jilong Zhang, F. Galeazzi, B. Z. Dai, F. R. Zhu, Y. X. Yan, L. Zhang, F. Ruggieri, Piero Vallania, B. Panico, F. Shi, Y. H. Tan, Zhenyong Feng, C. Liu, P. Branchini, Danzengluobu, X. C. Yang, M. Dattoli, A. K. Calabrese Melcarne, Hongbo Hu, P. Pistilli, X. X. Zhou, C. Y. Wu, M. Iacovacci, M. Zha, X. H. Ma, A. Surdo, R. Cardarelli, C. F. Feng, M. Panareo, J. K. K. Liu, A. Cappa, G. Marsella, Bingwei Xu, E. Giroletti, X. Y. Zhang, Zhiguo Yao, H. H. He, Q. Q. Zhu, Q. B. Gou, A. F. Yuan, Minghui Liu, P. Creti, P. Galeotti, A. Budano, P. Salvini, Labaciren, Jianli Zhang, A. Pagliaro, I. De Mitri, X. D. Sheng, P. R. Shen, Paolo Bernardini, S. Mastroianni, T. Di Girolamo, T. L. Chen, H. M. Zhang, P. Celio, Q. Huang, Q. Y. Yang, I. Bolognino, G. Liguori, Zhaxiciren, G. Zizzi, J. Y. Li, G. Di Sciascio, C. X. Liu, H. W. Wang, G. D'Alí Staiti, Y. B. Chen, H. Y. Jia, Carlo Vigorito, Irina James, G. Mancarella, Paolo Camarri, L. Perrone, Zihuang Cao, X. X. Li, B. S. Wang, Zhaxisangzhu, S. M. Mari, P. F. Zhang, X. J. Bi, S. Z. Chen, C. Cattaneo, E. Rossi, Paolo Montini, R. Iuppa, S. Vernetto, S. Catalanotti, S. W. Cui, Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cappa, A, Cardarelli, R, Catalanotti, S, Cattaneo, C, Celio, P, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui, SW, Dai, BZ, D’Ali' Staiti, G, Danzengluobu, Dattoli, M, De Mitri, I, D’Ettorre Piazzoli, B, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Galeotti, P, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HBa, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Labaciren, Li, HJ, Li, JY, Li, XX, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Qu, XB, Rossi, E, Ruggieri, F, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLo, Zhang, JLi, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhaxiciren, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, Bartoli, Bruno, Catalanotti, Sergio, D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Iacovacci, Michele, B., Bartoli, Bernardini, Paolo, X. J., Bi, C., Bleve, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, A., Cappa, R., Cardarelli, S., Catalanotti, C., Cattaneo, P., Celio, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D’Alı´staiti, M., Dattoli, DE MITRI, Ivan, B., D’Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, F., Galeazzi, P., Galeotti, E., Giroletti, Q. B., Gou, Y. Q., Guo, H. H., He, Haibing, Huo, Hongbo, Hue, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, H. J., Li, J. Y., Li, X. X., Li, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, X. B., Qu, E., Rossi, F., Ruggieri, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, Jilongzhang, Jianlizhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, Zhaxiciren, Zhaxisangzhu, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, Barton, B, Bi, Xj, Melcarne, Akc, Chen, Sz, Chen, Tl, Cui, Sw, Dai, Bz, Staiti, Gd, Piazzoli, Bd, Ding, Xh, Feng, Cf, Feng, Zy, Gou, Qb, Guo, Yq, He, Hh, Hu, Hb, Ilacovacci, M, Jia, Hy, Li, Hj, Li, Jy, Li, Xx, Liu, Cq, Liu, My, Ma, Xh, Mari, Stefano Maria, Ning, Cc, Qu, Xb, Santonicoi, R, Shen, Pr, Sheng, Xd, Tan, Yh, Wu, Cy, Wu, Hr, Xu, B, Yan, Yx, Yang, Qy, Yang, Xc, Yao, Zg, Yuan, Af, Zhang, Hm, Zhang, Jl, Zhang, Xy, Zhou, Xx, Zhu, Fr, Zhu, Qq, and Zizzi, G.
Subjects: Wide field of view, Nuclear and High Energy Physics, Monitoring, Astrophysics::High Energy Astrophysical Phenomena, ARGO-YBJ, Flaring phenomenon, VHE extragalactic source, Astrophysics, Settore FIS/05 - Astronomia E Astrofisica, Instrumentation, Sorgenti VHE extragalattiche, Argo, Cherenkov radiation, Physics, Fenomeni transienti, Warning system, Detector, Settore FIS/01 - Fisica Sperimentale, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Monitoring Flaring Phenomenon, Astronomy, Wide field, Duty cycle, Ampio campo di vista, Flaring phenomena, VHE extragalactic sources, Gamma Ray Bursts, Large Field of view telescope, ARGO-YBJ, Gamma-ray burst
Abstract: Detecting and monitoring emissions from flaring gamma-ray sources in the very-high-energy (VHE, > 100 GeV) band is a very important topic in gamma-ray astronomy. The ARGO-YBJ detector is characterized by a high duty cycle and a wide field of view. Therefore, it is particularly capable of detecting flares from extragalactic objects. Based on fast reconstruction and analysis, real-time monitoring of 33 selected VHE extragalactic sources is implemented. Flares exceeding a specific threshold are reported timely, hence enabling the follow-up observation of these objects using more sensitive detectors, such as Cherenkov telescopes. (C) 2011 Elsevier B.V. All rights reserved.
Published: 2011

10. Gamma-Ray Flares from Mrk421 in 2008 observed with the ARGO-YBJ detector

Author: Aielli, G., Bacci, C., Bartoli, B., Bernardini, P., Xj, B., Bleve, C., Branchini, P., Budano, A., Bussino, S., Calabrese Melcarne, A., Camarri, P., Cao, Z., Cappa, A., Cardarelli, R., Catalanotti, S., Cattaneo, C., Celio, P., Chen, S., Chen, Y., Cheng, N., Creti, P., Cui, S., Dai, B., D'Ali'Staiti, G., Danzengluobu, Dattoli, M., De Mitri, I., D’Ettorre Piazzoli, B., De Vincenzi, M., Di Girolamo, T., Ding, X., Di Sciascio, G., Feng, C., Feng, Z., Galeazzi, F., Galeotti, P., Gargana, R., Gou, Q., Guo, Y., Hh, H., Hbi, H., Hbo, H., Huang, Q., Iacovacci, M., Iuppa, R., James, I., Jia, H., Labaciren, Hj, L., Jy, L., Xx, L., Liberti, B., Liguori, G., Liu, C., Liu, J., Liu, M., Lu, H., Xh, M., Mancarella, G., Mari, S., Marsella, G., Martello, D., Mastroianni, S., Meng, X., Montini, P., Ning, C., Pagliaro, A., Panareo, M., Perrone, L., Pistilli, P., Xb, Q., Rossi, E., Ruggieri, F., Saggese, L., Salvini, P., Santonico, R., Shen, P., Sheng, X., Shi, F., Stanescu, C., Surdo, A., Tan, Y., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., Cy, W., Hr, W., Xu, B., Xue, L., Yan, Y., Yang, Q., Yang, X., Yuan, A., Zha, M., Zhang, H., Zhang, J., Zhang, L., Zhang, P., Zhang, X., Zhang, Y., Zhaxisangzhu, Zhou, X., Zhu, F., Zhu, Q., Zizzi, G., G., Aielli, C., Bacci, B., Bartoli, Bernardini, Paolo, X. J., Bi, C., Bleve, P., Branchini, A., Budano, S., Bussino, A. K., CALABRESE MELCARNE, P., Camarri, Z., Cao, A., Cappa, R., Cardarelli, S., Catalanotti, C., Cattaneo, P., Celio, S. Z., Chen, Y., Chen, N., Cheng, P., Creti, S. W., Cui, B. Z., Dai, G., D’ALÍ STAITI, Danzengluobu, M., Dattoli, DE MITRI, Ivan, B., D’ETTORRE PIAZZOLI, M., DE VINCENZI, T., DI GIROLAMO, X. H., Ding, G., DI SCIASCIO, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, F., Galeazzi, P., Galeotti, R., Gargana, Q. B., Gou, Y. Q., Guo, H. H., He, Haibing, Hu, Hongbo, Hu, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, Labaciren, H. J., Li, J. Y., Li, X. X., Li, B., Liberti, G., Liguori, C., Liu, C. Q., Liu, M. Y., Liu, J., Liu, H., Lu, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, X. R., Meng, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, Perrone, Lorenzo, P., Pistilli, X. B., Qu, E., Rossi, F., Ruggieri, L., Saggese, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, A. F., Yuan, M., Zha, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, Zhaxisangzhu, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, Zizzi, Giovanni, Aielli, G, Bacci, C, Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Branchini, P, Budano, A, Bussino, S, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cappa, A, Cardarelli, R, Catalanotti, S, Cattaneo, C, Celio, P, Chen, SZ, Chen, Y, Cheng, N, Creti, P, Cui, SW, Dai, BZ, D’Ali Staiti, G, Dattoli, M, De Mitri, I, D’Ettorre Piazzoli, B, De Vincenzi, M, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Galeotti, P, Gargana, R, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Li, HJ, Li, JY, Li, XX, Liberti, B, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Meng, XR, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Perrone, L, Pistilli, P, Qu, XB, Rossi, E, Ruggieri, F, Saggese, L, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, Bi, Xj, Bussino, Severino Angelo Maria, Melcarne, Akc, Chen, Sz, Cui, Sw, Dai, Bz, Staiti, Gd, Piazzoli, Bd, Ding, Xh, Feng, Cf, Feng, Zy, Gou, Qb, Guo, Yq, He, Hh, Hu, Hb, Jia, Hy, Li, Hj, Li, Jy, Li, Xx, Liu, Cq, Liu, My, Ma, Xh, Mari, Stefano Maria, Meng, Xr, Ning, Cc, Qu, Xb, Shen, Pr, Sheng, Xd, Tan, Yh, Wu, Cy, Wu, Hr, Yan, Yx, Yang, Qy, Yang, Xc, Yuan, Af, Zhang, Hm, Zhang, Jl, Zhang, Xy, Zhou, Xx, Zhu, Fr, Zhu, Qq, Zizzi, G., Bartoli, Bruno, Catalanotti, Sergio, D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Iacovacci, Michele, and Mastroianni, Stefano
Subjects: Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Flux, Astrophysics, BL Lacertae object, Settore FIS/05 - Astronomia E Astrofisica, Extended Air showers, Settore FIS/05 - Astronomia e Astrofisica, general" ["gamma rays], Blazar, BL Lacertae objects, Markarian 421, gamma rays, Cherenkov radiation, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Spectral index, individual (Markarian 421)" ["BL Lacertae objects], Settore FIS/01 - Fisica Sperimentale, Gamma ray, individual (Markarian 421) - gamma rays: observations [BL Lacertae objects], Astronomy and Astrophysics, Air shower, Crab Nebula, Space and Planetary Science, gamma ray, Intergalactic travel, Astrophysics - High Energy Astrophysical Phenomena
Abstract: In 2008 the blazar Markarian 421 entered a very active phase and was one of the brightest sources in the sky at TeV energies, showing frequent flaring episodes. Using the data of ARGO-YBJ, a full coverage air shower detector located at Yangbajing (4300 m a.s.l., Tibet, China), we monitored the source at gamma ray energies E > 0.3 TeV during the whole year. The observed flux was variable, with the strongest flares in March and June, in correlation with X-ray enhanced activity. While during specific episodes the TeV flux could be several times larger than the Crab Nebula one, the average emission from day 41 to 180 was almost twice the Crab level, with an integral flux of (3.6 +-0.6) 10^-11 photons cm^-2 s^-1 for energies E > 1 TeV, and decreased afterwards. This paper concentrates on the flares occurred in the first half of June. This period has been deeply studied from optical to 100 MeV gamma rays, and partially up to TeV energies, since the moonlight hampered the Cherenkov telescope observations during the most intense part of the emission. Our data complete these observations, with the detection of a signal with a statistical significance of 3.8 standard deviations on June 11-13, corresponding to a gamma ray flux about 6 times larger than the Crab one above 1 TeV. The reconstructed differential spectrum, corrected for the intergalactic absorption, can be represented by a power law with an index alpha = -2.1 extending up to several TeV. The spectrum slope is fully consistent with previous observations reporting a correlation between the flux and the spectral index, suggesting that this property is maintained in different epochs and characterizes the source emission processes., Accepted for publication on ApJL
Published: 2010

11. Proton-air cross section measurement with the ARGO-YBJ cosmic ray experiment

Author: I. De Mitri, B. D'Ettorre Piazzoli, A. K. Calabrese Melcarne, P. Pistilli, H. M. Zhang, G. Marsella, X. X. Zhou, Enrico Rossi, Giovanni Mancarella, L. Xue, F. Galeazzi, P. Galeotti, C. Liu, Jilong Zhang, G. D'Alí Staiti, P. Vallania, A. Surdo, X. X. Li, Q. Huang, Giulio Aielli, Hong-peng Lu, X. H. Ma, Longzhou Zhang, Q. Q. Zhu, C. Bacci, G. Liguori, Haibing Hu, M. Y. Liu, A. Pagliaro, A. F. Yuan, Zhenyong Feng, Huaguang Wang, C. Bleve, Paolo Camarri, Y. Zhang, B. Bartoli, X. D. Sheng, Fudong Shi, Q. Y. Yang, N. Cheng, X. R. Meng, G. Zizzi, D. Martello, J. K. K. Liu, C. Cattaneo, J. Y. Li, R. Gargana, Danzengluobu, Labaciren, S. Mastroianni, R. Santonico, M. Iacovacci, Chang-Chun Ning, B. S. Wang, S. M. Mari, X. Y. Zhang, L. Perrone, Zhaxisangzhu, Zhaoyang Feng, Y. Q. Guo, Jianli Zhang, P. Creti, Zihuang Cao, F. Ruggieri, A. Cappa, Carlo Vigorito, Y. X. Yan, Antonio Budano, S. W. Cui, C. Y. Wu, Barbara Liberti, X. B. Qu, C. Q. Liu, X. C. Yang, P. Salvini, X. H. Ding, L. Saggese, P. F. Zhang, X. J. Bi, Irina James, Roberto Cardarelli, P. Bernardini, S. Z. Chen, Y. H. Tan, F. R. Zhu, Paolo Montini, R. Iuppa, S. Catalanotti, M. Panareo, G. Di Sciascio, T. Di Girolamo, P. Celio, H.H. He, M. Dattoli, M. De Vincenzi, Y. B. Chen, Hongbo Hu, C. F. Feng, H. Y. Jia, H. J. Li, S. Vernetto, H. R. Wu, P. R. Shen, M. Zha, B. Z. Dai, Cristian Stanescu, P. Branchini, Bingwei Xu, Severino Angelo Maria Bussino, Q. B. Gou, Aielli, G, Bacci, C, Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Branchini, P, Budano, A, Bussino, S, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cappa, A, Cardarelli, R, Catalanotti, S, Cattaneo, C, Celio, P, Chen, SZ, Chen, Y, Cheng, N, Creti, P, Cui, SW, Dai, BZ, D'Ali'Staiti, G, Danzengluobu, Dattoli, M, De Mitri, I, D'Ettorre Piazzoli, B, De Vincenzi, M, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, F, Feng, ZYa, Feng, ZYo, Galeazzi, F, Galeotti, P, Gargana, R, Gou, QB, Guo, YQ, He, HH, Hu, HaB, Hu, HoB, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Labaciren, Li, HJ, Li, JY, Li, XX, Liberti, B, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Meng, XR, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Perrone, L, Pistilli, P, Qu, XB, Rossi, E, Ruggieri, F, Saggese, L, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, G., Aielli, C., Bacci, B., Bartoli, Bernardini, Paolo, X. J., Bi, Bleve, Carla, P., Branchini, A., Budano, S., Bussino, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, A., Cappa, R., Cardarelli, S., Catalanotti, C., Cattaneo, P., Celio, S. Z., Chen, Y., Chen, N., Cheng, P., Creti, S. W., Cui, B. Z., Dai, G., D’Ali' Staiti, M., Dattoli, DE MITRI, Ivan, B., D’Ettorre Piazzoli, M., De Vincenzi, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, F., Galeazzi, P., Galeotti, R., Gargana, Q. B., Gou, Y. Q., Guo, H. H., He, Haibing, Hu, Hongbo, Hu, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, H. J., Li, J. Y., Li, X. X., Li, B., Liberti, G., Liguori, C., Liu, C. Q., Liu, M. Y., Liu, J., Liu, H., Lu, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, X. R., Meng, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, Perrone, Lorenzo, P., Pistilli, X. B., Qu, E., Rossi, F., Ruggieri, L., Saggese, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, A. F., Yuan, M., Zha, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, Zizzi, Giovanni, Bi, Xj, Bussino, Severino Angelo Maria, Melcarne, Akc, Chen, Sz, Cui, Sw, Dai, Bz, Staiti, Gd, Piazzoli, Bd, Ding, Xh, Feng, Cf, Feng, Zy, Gou, Qb, Guo, Yq, He, Hh, Hu, Hb, Jia, Hy, Li, Hj, Li, Jy, Li, Xx, Liu, Cq, Liu, My, Ma, Xh, Mari, Stefano Maria, Meng, Xr, Ning, Cc, Qu, Xb, Shen, Pr, Sheng, Xd, Tan, Yh, Wu, Cy, Wu, Hr, Yan, Yx, Yang, Qy, Yang, Xc, Yuan, Af, Zhang, Hm, Zhang, Jl, Zhang, Xy, Zhou, Xx, Zhu, Fr, Zhu, Qq, Zizzi, G., Bartoli, Bruno, Catalanotti, Sergio, B., D???Ettorre Piazzoli, DI GIROLAMO, Tristano, Iacovacci, Michele, and Collaborazione ARGO, Ybj
Subjects: Nuclear and High Energy Physics, Cosmic rays, Proton-air cross section, gamma astronomy, Proton, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Cosmic ray, Cross Section, 01 natural sciences, Cosmic Ray, High Energy Physics - Experiment, Nuclear physics, 0103 physical sciences, Multiplicity (chemistry), 010306 general physics, Nuclear Experiment, Zenith, Argo, Physics, 010308 nuclear & particles physics, Attenuation, Detector, Settore FIS/01 - Fisica Sperimentale, Astrophysics::Instrumentation and Methods for Astrophysics, 3. Good health, Hadronic Interaction, High Energy Physics::Experiment, Extensive Air Showers
Abstract: The proton-air cross section in the energy range 1-100 TeV has been measured by the ARGO-YBJ cosmic ray experiment. The analysis is based on the flux attenuation for different atmospheric depths (i.e. zenith angles) and exploits the detector capabilities of selecting the shower development stage by means of hit multiplicity, density and lateral profile measurements at ground. The effects of shower fluctuations, the contribution of heavier primaries and the uncertainties of the hadronic interaction models, have been taken into account. The results have been used to estimate the total proton-proton cross section at center of mass energies between 70 and 500 GeV, where no accelerator data are currently available., Comment: 14 pages, 9 figures
Published: 2009

12. Highlights from the ARGO-YBJ Experiment

Author: L. Perrone, Carlo Vigorito, X. C. Yang, A. Cappa, Zihuang Cao, Haibing Hu, R. Santonico, H. H. He, C. Liu, Irina James, P. Salvini, C. Bleve, Y. Zhang, X. H. Ma, D. Martello, G. Aielli, Bingwei Xu, X. Y. Zhang, X. X. Li, Severino Angelo Maria Bussino, Q. B. Gou, B. S. Wang, Zhaxisangzhu, Jilong Zhang, A. Pagliaro, Y. X. Yan, F. Shi, M. Iacovacci, M. Zha, M. Dattoli, B. D'Ettorre Piazzoli, Y. Q. Guo, X. D. Sheng, P. R. Shen, H. J. Li, H. R. Wu, P. Pistilli, X. X. Zhou, Piero Vallania, Paolo Bernardini, C. Cattaneo, P. Galeotti, G. Marsella, X. R. Meng, L. Xue, P. Camarri, X. B. Qu, J. K. K. Liu, Q. Huang, Hongbo Hu, Hong-peng Lu, G. Mancarella, C. Stanescu, Chang-Chun Ning, X. H. Ding, A. Surdo, C. F. Feng, Zhaoyang Feng, F. Galeazzi, Y. H. Tan, P. Creti, Zhenyong Feng, Jianli Zhang, M. Y. Liu, B. Liberti, I. De Mitri, T. Di Girolamo, N. Cheng, P. Celio, Q. Q. Zhu, T. L. Chen, H. M. Zhang, S. W. Cui, S. M. Mari, B. Z. Dai, F. Ruggieri, C. Y. Wu, P. Branchini, F. R. Zhu, L. Saggese, M. Panareo, Q. Y. Yang, G. Zizzi, G. D'Alí Staiti, S. Catalanotti, L. Zhang, J. Y. Li, E. Rossi, P. F. Zhang, Y. B. Chen, Paolo Montini, X. J. Bi, R. Iuppa, S. Vernetto, H. W. Wang, S. Z. Chen, A. Budano, A. K. Calabrese Melcarne, S. Mastroianni, R. Cardarelli, B. Bartoli, R. Gargana, Labaciren, A. F. Yuan, G. Di Sciascio, M. De Vincenzi, Danzengluobu, G. Liguori, C. X. Liu, H. Y. Jia, C. Bacci, Aielli, G, Bacci, C, Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Branchini, P, Budano, A, Bussino, S, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cappa, A, Cardarelli, R, Catalanotti, S, Cattaneo, C, Celio, P, Chen, SZ, Chen, TL, Chen, Y, Cheng, N, Creti, P, Cui, SW, Dai, BZ, D’AlìStaiti, G, Danzengluobu, Dattoli, M, De Mitri, I, D’Ettorre Piazzoli, B, De Vincenzi, M, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Galeotti, P, Gargana, R, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, J, Jia, HY, Labaciren, Li, HJ, Li, JY, Li, XX, Liberti, B, Liguori, G, Liu, C, Liu, CQ, Liu, MY, Liu, J, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Meng, XR, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Perrone, L, Pistilli, P, Qu, XB, Rossi, E, Ruggieri, F, Saggese, L, Salvini, P, Santonico, R, Shen PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, G., Aielli, C., Bacci, B., Bartoli, Bernardini, Paolo, X. J., Bi, C., Bleve, P., Branchini, A., Budano, S., Bussino, A. K., CALABRESE MELCARNE, P., Camarri, Z., Cao, A., Cappa, R., Cardarelli, S., Catalanotti, C., Cattaneo, P., Celio, S. Z., Chen, Y., Chen, N., Cheng, P., Creti, S. W., Cui, B. Z., Dai, G., D’ALÍ STAITI, M., Dattoli, DE MITRI, Ivan, B., D’ETTORRE PIAZZOLI, M., DE VINCENZI, T., DI GIROLAMO, X. H., Ding, G., DI SCIASCIO, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, F., Galeazzi, P., Galeotti, R., Gargana, Q. B., Gou, Y. Q., Guo, H. H., He, Haibing, Hu, Hongbo, Hu, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, H. J., Li, J. Y., Li, X. X., Li, B., Liberti, G., Liguori, C., Liu, C. Q., Liu, M. Y., Liu, J., Liu, H., Lu, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, X. R., Meng, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, Perrone, Lorenzo, P., Pistilli, X. B., Qu, E., Rossi, F., Ruggieri, L., Saggese, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, A. F., Yuan, M., Zha, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, Bi, Xj, Bussino, Severino Angelo Maria, Calabrese Melcarne, Ak, Chen, Sz, Chen, Tl, Cui, Sw, Dai, Bz, D'Ali Staiti, G, D'Ettorre Piazzoli, B, DE VINCENZI, Mario, Ding, Xh, Feng, Cf, Feng Zhao, Yang, Feng Zhen, Yong, Gou, Qb, Guo, Yq, He, Hh, Hu, Haibing, Hu Hong, Bo, James, I, Jia, Hy, Li, Hj, Li, Jy, Li, Xx, Liu, Cq, Liu, My, Ma, Xh, Mari, Stefano Maria, Meng, Xr, Ning, Cc, Qu, Xb, Shen, Pr, Sheng, Xd, Tan, Yh, Wu, Cy, Wu, Hr, Yan, Yx, Yang, Qy, Yang, Xc, Yuan, Af, Zhang, Hm, Zhang Ji, Long, Zhang Jian, Li, Zhang, Xy, Zhou, Xx, Zhu, Fr, Zhu, Qq, Zizzi, G., Feng, Zhao-Yang, Feng, Zhen-Yong, Hu, Hong-Bo, Mari, Sm, Zhang, Ji-Long, Zhang, Jian-Li, A. K., Calabrese Melcarne, T. L., Chen, G., D’Alı´ Staiti, B., D’Ettorre Piazzoli, M., De Vincenzi, T., Di Girolamo, G., Di Sciascio, L., Xu, Aielli, G., Bacci, C., Bartoli, Bruno, Bernardini, P., Bleve, C., Branchini, P., Budano, A., Bussino, S., Calabrese Melcarne, A. K., Camarri, P., Cao, Z., Cappa, A., Cardarelli, R., Catalanotti, Sergio, Cattaneo, C., Celio, P., Chen, S. Z., Chen, T. L., Chen, Y., Cheng, N., Creti, P., Cui, S. W., Dai, B. Z., D’Alí Staiti, G., Dattoli, M., De Mitri, I., D'ETTORRE PIAZZOLI, Benedetto, De Vincenzi, M., DI GIROLAMO, Tristano, Ding, X. H., Di Sciascio, G., Feng, C. F., Galeazzi, F., Galeotti, P., Gargana, R., Gou, Q. B., Guo, Y. Q., Huang, Q., Iacovacci, Michele, Iuppa, R., James, I., Jia, H. Y., Liberti, B., Liguori, G., Liu, C., Liu, C. Q., Liu, M. Y., Liu, J., Lu, H., Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Meng, X. R., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Perrone, L., Pistilli, P., Rossi, E., Ruggieri, F., Saggese, L., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., Xu, B., Xue, L., Yan, Y. X., Yang, Q. Y., Yang, X. C., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhou, X. X., Zhu, F. R., and Zhu, Q. Q.
Subjects: History, Astronomy, Flux, Astrophysics, Proton flux, 01 natural sciences, Argo-Ybj, Gamma-ray emission, Settore FIS/05 - Astronomia E Astrofisica, Cosmic-ray physics, Resistive Plate Chambers, Instrumentation, 010303 astronomy & astrophysics, Argo, Physics, Range (particle radiation), Detector, Settore FIS/01 - Fisica Sperimentale, Crab nebula, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Crab nebula, Extensive air showers, Flux ratio, Gamma-ray astronomy, Gamma-ray emission, Ground based, Resistive plate chambers, Astronomy, Cosmic rays, Cosmology, Experiments, Gamma rays, Flux ratio, Cosmology, Computer Science Applications, Resistive plate chambers, Nuclear and High Energy Physics, X- and γ-ray instrument, Ground-based gamma-ray astronomy, Astrophysics::High Energy Astrophysical Phenomena, Extensive air shower, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Cosmic Ray, Education, Resistive Plate Chambers, Extensive air showers, Ground-based g ray astronomy, Cosmic-ray physics, Ground-based γ-ray astronomy, 0103 physical sciences, Extensive air showers, Cosmic rays, Extensive air showers, X- and γ-ray instruments, Pulsars. Quasars, active or peculiar galaxies, objects and systems, Astrophysics::Galaxy Astrophysics, Gamma-ray astronomy, 010308 nuclear & particles physics, Resistive Plate Chamber, Ground based, Crab Nebula, Antiproton, Satellite, Gamma-ray burst, Experiments
Abstract: ""The ARGO-YBJ experiment at YangBaJing in Tibet (4300m a.s.l.) has been taking data with its full layout since October 2007. Here we present a few significant results obtained in gamma-ray astronomy and cosmic-ray physics. Emphasis is placed on the analysis of gamma-ray emission from point-like sources (Crab Nebula, MRK 421), on the preliminary limit on the antiproton\\\/proton flux ratio, on the large-scale cosmic-ray anisotropy and on the proton-air cross-section. The performance of the detector is also discussed, and the perspectives of the experiment are outlined.""
Published: 2012
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13. Observation of TeV gamma-rays from the unidentified source HESS J1841-055 with the ARGO-YBJ experiment

Author: B. Bartoli1, 2, P. Bernardini3, 4, X. J. Bi5, I. Bolognino6, 7, P. Branchini8, A. Budano8, A. K. Calabrese Melcarne9, P. Camarri10, Z. Cao5, R. Cardarelli11, S. Catalanotti1, C. Cattaneo7, S. Z. Chen5, T. L. Chen12, Y. Chen5, P. Creti4, S. W. Cui13, B. Z. Dai14, G. D’Al´ı Staiti15, A. D’Amone3, 4, Danzengluobu12, I. De Mitri3, B. D’Ettorre Piazzoli1, T. Di Girolamo1, X. H. Ding12, G. Di Sciascio11, C. F. Feng17, Zhaoyang Feng5, Zhenyong Feng18, F. Galeazzi8, E. Giroletti6, Q. B. Gou5, Y. Q. Guo5, H. H. He5, Haibing Hu12, Hongbo Hu5, Q. Huang18, M. Iacovacci1, R. Iuppa10, I. James8, H. Y. Jia18, Labaciren12, H. J. Li12, J. Y. Li17, X. X. Li5, G. Liguori6, C. Liu5, C. Q. Liu14, J. Liu14, M. Y. Liu12, H. Lu5, L. L. Ma5, X. H. Ma5, G. Mancarella3, 8, 19, G. Marsella3, D. Martello3, S. Mastroianni2, P. Montini8, C. C. Ning12, A. Pagliaro16, M. Panareo3, B. Panico10, L. Perrone3, P. Pistilli8, F. Ruggieri8, P. Salvini7, R. Santonico10, S. N. Sbano3, P. R. Shen5, X. D. Sheng5, F. Shi5, A. Surdo4, Y. H. Tan5, P. Vallania21, S. Vernetto21, C. Vigorito22, B. Wang5, H. Wang5, C. Y. Wu5, H. R. Wu5, B. Xu18, L. Xue17, Q. Y. Yang14, X. C. Yang14, Z. G. Yao5, A. F. Yuan12, M. Zha5, H. M. Zhang5, Jilong Zhang5, Jianli Zhang5, L. Zhang14, P. Zhang14, X. Y. Zhang17, Y. Zhang5, J. Zhao5, Zhaxiciren12, Zhaxisangzhu12, X. X. Zhou18, F. R. Zhu18, Q. Q. Zhu5, G. Zizzi9 1 Dipartimento di Fisica dell’Universit`a di Napoli 'Federico II, ' Complesso Universitario di Monte Sant’Angelo, via Cinthia, I. 80126 Napoli, Italy 2 Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, Italy 3 Dipartimento Matematica e. Fisica 'Ennio De Giorgi, ' Universit`a del Salento, via per Arnesano, I. 73100 Lecce, Italy 4 Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Italy 5 Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, P. O. Box 918, 100049 Beijing, China, c.h.e.n.s.z.@.i.h.e.p. a.c. cn 6 Dipartimento di Fisica dell’Universit`a di Pavia, via Bassi 6, I. 27100 Pavia, Italy 7 Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Italy 8 Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, via della Vasca Navale 84, I. 00146 Roma, Italy 9 Istituto Nazionale di Fisica Nucleare CNAF, Viale Berti Pichat 6/2, I. 40127 Bologna, Italy 10 Dipartimento di Fisica dell’Universit`a di Roma 'Tor Vergata, ' via della Ricerca Scientifica 1, I. 00133 Roma, Italy 11 Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tor Vergata, via della Ricerca Scientifica 1, Italy 12 Tibet University, 850000 Lhasa, Xizang, China 13 Hebei Normal University, Shijiazhuang 050016, Hebei, China 14 Yunnan University, 2 North Cuihu Road, 650091 Kunming, Yunnan, China 15 Dipartimento di Fisica, Universit`a degli Studi di Palermo, Viale delle Scienze, Edificio 18, I. 90128 Palermo, Italy 16 Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Viale A. Doria 6, I. 95125 Catania, Italy 17 Shandong University, 250100 Jinan, Shandong, China 18 Southwest Jiaotong University, 610031 Chengdu, Sichuan, China 19 Dipartimento di Fisica dell’Universit`a 'Roma Tre, ' via della Vasca Navale 84, Italy 20 Istituto di Astrofisica Spaziale e. Fisica Cosmica dell’Istituto Nazionale di Astrofisica, via La Malfa 153, I. 90146 Palermo, Italy 21 Osservatorio Astrofisico di Torino dell’Istituto Nazionale di Astrofisica, corso Fiume 4, I. 10133 Torino, Italy 22 Istituto Nazionale di Fisica Nucleare, Sezione di Torino, via P. Giuria 1, I. 10125 Torino, Italy 23 Dipartimento di Fisica dell’Universit`a di Torino, Italy, MARI, Stefano Maria, Bartoli, Bruno, Bernardini, P., X. J., Bi, Bolognino, I., Branchini, P., Budano, A., Calabrese Melcarne, A. K., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, Sergio, Cattaneo, C., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., D'Al? Staiti, G., D'Amone, A., Danzengluobu, De Mitri, I., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Ding, X. H., Di Sciascio, G., Feng, C. F., Zhaoyang, Feng, Zhenyong, Feng, Galeazzi, F., Giroletti, E., Gou, Q. B., Guo, Y. Q., H. H., He, Haibing, Hu, Hongbo, Hu, Huang, Q., Iacovacci, Michele, Iuppa, R., James, I., Jia, H. Y., Labaciren, H. J., Li, J. Y., Li, X. X., Li, Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., L. L., Ma, X. H., Ma, Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Ruggieri, F., Salvini, P., Santonico, R., Sbano, S. N., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., C. Y., Wu, H. R., Wu, Xu, B., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Jilong, Zhang, Jianli, Zhang, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., B., Bartoli1, P., Bernardini3, X. J., Bi5, I., Bolognino6, P., Branchini8, A., Budano8, A. K., Calabrese Melcarne9, P., Camarri10, Z., Cao5, R., Cardarelli11, S., Catalanotti1, C., Cattaneo7, S. Z., Chen5, T. L., Chen12, Y., Chen5, P., Creti4, S. W., Cui13, B. Z., Dai14, G., D’Al´ı Staiti15, A., D’Amone3, 4, Danzengluobu12, I., De Mitri3, B., D’Ettorre Piazzoli1, T., Di Girolamo1, X. H., Ding12, G., Di Sciascio11, C. F., Feng17, Zhaoyang, Feng5, Zhenyong, Feng18, F., Galeazzi8, E., Giroletti6, Q. B., Gou5, Y. Q., Guo5, H. H., He5, Haibing, Hu12, Hongbo, Hu5, Q., Huang18, M., Iacovacci1, R., Iuppa10, I., James8, H. Y., Jia18, Labaciren12, H. J., Li12, J. Y., Li17, X. X., Li5, G., Liguori6, C., Liu5, C. Q., Liu14, J., Liu14, M. Y., Liu12, H., Lu5, L. L., Ma5, X. H., Ma5, G., Mancarella3, Mari, Stefano Maria, 8, 19, G., Marsella3, D., Martello3, S., Mastroianni2, Montini8, P., C. C., Ning12, A., Pagliaro16, M., Panareo3, B., Panico10, L., Perrone3, P., Pistilli8, Ruggieri8, F., P., Salvini7, R., Santonico10, S. N., Sbano3, P. R., Shen5, X. D., Sheng5, F., Shi5, A., Surdo4, Y. H., Tan5, P., Vallania21, S., Vernetto21, C., Vigorito22, B., Wang5, H., Wang5, C. Y., Wu5, H. R., Wu5, B., Xu18, L., Xue17, Q. Y., Yang14, X. C., Yang14, Z. G., Yao5, A. F., Yuan12, M., Zha5, H. M., Zhang5, Jilong, Zhang5, Jianli, Zhang5, L., Zhang14, P., Zhang14, X. Y., Zhang17, Y., Zhang5, J., Zhao5, Zhaxiciren12, Zhaxisangzhu12, X. X., Zhou18, F. R., Zhu18, Q. Q., Zhu5, G., Zizzi9 1 Dipartimento di Fisica dell’Universit`a di Napoli 'Federico II, ' Complesso Universitario di Monte, Sant’Angelo, Via, Cinthia, I., 80126 Napoli, Italy, 2 Istituto Nazionale di Fisica Nucleare, Sezione di, Napoli, Complesso Universitario di Monte, Sant’Angelo, Italy 3 Dipartimento Matematica e., Fisica 'Ennio De Giorgi, ' Universit`a del, Salento, via per, Arnesano, I., 73100 Lecce, Italy, 4 Istituto Nazionale di Fisica Nucleare, Sezione di, Lecce, Italy, 5 Key Laboratory of Particle Astrophysic, Institute of High Energy, Physic, Chinese Academy of, Science, P. O., Box 918, 100049, Beijing, China, cn 6 Dipartimento di Fisica dell’Universit`a di Pavia, c. h. e. n. s. z. @. i. h. e. p. a. c., via Bassi, 6, I., 27100 Pavia, Italy, 7 Istituto Nazionale di Fisica Nucleare, Sezione di, Pavia, Italy, 8 Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Tre, via della Vasca Navale, 84, I., 00146 Roma, Italy, 9 Istituto Nazionale di Fisica Nucleare CNAF, Viale Berti Pichat, 6/2, I., 40127 Bologna, Italy 10 Dipartimento di Fisica dell’Universit`a di Roma 'Tor, Vergata, ' via della Ricerca Scientifica, 1, I., 00133 Roma, Italy 11 Istituto Nazionale di Fisica, Nucleare, Sezione di Roma Tor, Vergata, via della Ricerca Scientifica, 1, Italy 12 Tibet, University, 850000, Lhasa, Xizang, China 13 Hebei Normal, University, Shijiazhuang, 050016, Hebei, China 14 Yunnan, University, 2 North Cuihu, Road, 650091, Kunming, Yunnan, China 15 Dipartimento di, Fisica, Universit`a degli Studi di, Palermo, Viale delle, Scienze, Edificio, 18, I., 90128 Palermo, Italy 16 Istituto Nazionale di Fisica, Nucleare, Sezione di, Catania, Viale A., Doria 6, I., 95125 Catania, Italy 17 Shandong, University, 250100, Jinan, Shandong, China 18 Southwest Jiaotong, University, 610031, Chengdu, Sichuan, China 19 Dipartimento di Fisica dell’Universit`a 'Roma, Tre, ' via della Vasca Navale, 84, Italy 20 Istituto di Astrofisica Spaziale e., Fisica Cosmica dell’Istituto Nazionale di Astrofisica, via La Malfa, 153, I., 90146 Palermo, Italy 21 Osservatorio Astrofisico di Torino dell’Istituto Nazionale di, Astrofisica, corso Fiume, 4, I., 10133 Torino, Italy 22 Istituto Nazionale di Fisica, Nucleare, Sezione di, Torino, via P., Giuria 1, I., 10125 Torino, Italy 23 Dipartimento di Fisica dell’Universit`a di, Torino, Italy, B., Bartoli, Bernardini, Paolo, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, C., Cattaneo, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D'Alí Staiti, D'Amone, Antonio, DE MITRI, Ivan, B., D'Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, F., Galeazzi, E., Giroletti, Q. B., Gou, Y. Q., Guo, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, F., Ruggieri, P., Salvini, R., Santonico, S. N., Sbano, P. R., Shen, X. D., Sheng, F., Shi, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, B., Xu, L., Xue, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, J., Zhao, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, Bartoli, B, Bernardini, P, Bi, XJ, Bolognino, I, Branchini, P, Budano, A, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cardarelli, R, Catalanotti, S, Cattaneo, C, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui, SW, Dai, BZ, D’Ali Staiti, G, D’Amone, A, De Mitri, I, D’Ettorre Piazzoli, B, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HaB, Hu, HoB, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Li, HJ, Li, JY, Li, XX, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, LL, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Ruggieri, F, Salvini, P, Santonico, R, Sbano, SN, Shen, PR, Sheng, XD, Shi, F, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhao, J, Zhou, XX, Zhu, FR, Zhu, QQ, and Zizzi, G
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Range (particle radiation), Photon, Degree (graph theory), 010308 nuclear & particles physics, Settore FIS/01 - Fisica Sperimentale, Gamma ray, Flux, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, 01 natural sciences, gamma rays, Wavelength, Settore FIS/05 - Astronomia E Astrofisica, Space and Planetary Science, Coincident, 0103 physical sciences, Gamma Rays, Argo-YBJ, Extended Air Shower Detectors, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, general [gamma rays], Energy (signal processing)
Abstract: We report the observation of a very high energy \gamma-ray source, whose position is coincident with HESS J1841-055. This source has been observed for 4.5 years by the ARGO-YBJ experiment from November 2007 to July 2012. Its emission is detected with a statistical significance of 5.3 standard deviations. Parameterizing the source shape with a two-dimensional Gaussian function we estimate an extension \sigma=(0.40(+0.32,-0.22}) degree, consistent with the HESS measurement. The observed energy spectrum is dN/dE =(9.0-+1.6) x 10^{-13}(E/5 TeV)^{-2.32-+0.23} photons cm^{-2} s^{-1} TeV^{-1}, in the energy range 0.9-50 TeV. The integral \gamma-ray flux above 1 TeV is 1.3-+0.4 Crab units, which is 3.2-+1.0 times the flux derived by HESS. The differences in the flux determination between HESS and ARGO-YBJ, and possible counterparts at other wavelengths are discussed., Comment: 17 pages, 4 figures, have been accepted for publication in ApJ

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13 results on '"Zhang, JLi"'

1. OBSERVATION OF THE TeV GAMMA-RAY SOURCE MGRO J1908+06 WITH ARGO-YBJ

2. Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment

3. Measurement of the cosmic ray antiproton/proton flux ratio at TeV energies with the ARGO-YBJ detector

4. Light-component spectrum of the primary cosmic rays in the multi-TeV region measured by the ARGO-YBJ experiment

5. Calibration of the RPC charge readout in the ARGO-YBJ experiment

6. Long-term monitoring of the TeV emission from Mrk 421 with the ARGO-YBJ experiment

7. Observation of the cosmic ray moon shadowing effect with the ARGO-YBJ experiment

8. Mean Interplanetary Magnetic Field Measurement Using the ARGO-YBJ Experiment

9. Early warning for VHE gamma-ray flares with the ARGO-YBJ detector

10. Gamma-Ray Flares from Mrk421 in 2008 observed with the ARGO-YBJ detector

11. Proton-air cross section measurement with the ARGO-YBJ cosmic ray experiment

12. Highlights from the ARGO-YBJ Experiment

13. Observation of TeV gamma-rays from the unidentified source HESS J1841-055 with the ARGO-YBJ experiment

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13 results on '"Zhang, JLi"'

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