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1. Observation of very high energy gamma-ray emission from the active galactic nucleus 1ES 1959+650 using the MAGIC telescope

Author

J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, M. Asensio, C. Baixeras, J. A. Barrio, H. Bartko, D. Bastieri, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, E. Bisesi, R. K. Bock, T. Bretz, I. Britvitch, M. Camara, A. Chilingarian, S. Ciprini, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, V. Danielyan, F. Dazzi, A. . Angelis, R. . los, B. . Lotto, E. Domingo Santamar\ia, D. Dorner, M. Doro, M. Errando, D. Ferenc, E. Fernandez, R. Firpo, J. Flix, M. V. Fonseca, L. Font, N. Galante, M. Garczarczyk, M. Gaug, J. Gebauer, R. Giannitrapani, M. Giller, F. Goebel, D. Hakobyan, M. Hayashida, T. Hengstebeck, D. H\ohne, J. Hose, P. Jacon, O. Kalekin, D. Kranich, A. Laille, T. Lenisa, P. Liebing, E. Lindfors, J. Lopez, M. Lopez, E. Lorenz, F. Lucarelli, P. Majumdar, G. Maneva, K. Mannheim, M. Mariotti, M. Mart\inez, K. Mase, D. Mazin, C. Merck, M. Merck, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, A. Moralejo, K. Nilsson, E. O\~na Wilhelmi, R. Ordu\~na, N. Otte, I. Oya, D. Paneque, R. Paoletti, M. Pasanen, D. Pascoli, F. Pauss, N. Pavel, R. Pegna, L. Peruzzo, A. Piccioli, M. Pin, E. Prandini, J. Rico, W. Rhode, B. Riegel, M. Rissi, A. Robert, G. Rossato, S. R\ugamer, A. Saggion, A. Sanchez, P. Sartori, V. Scalzotto, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, N. Sidro, A. Sillanp\a\a, D. Sobczynska, A. Stamerra, L. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, N. Tonello, A. Torres, D. F. Torres, N. Turini, H. Vankov, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, J. Zapatero, LONGO, FRANCESCO, J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, R. K., Bock, T., Bretz, I., Britvitch, M., Camara, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\ia, D., Dorner, M., Doro, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, N., Galante, M., Garczarczyk, M., Gaug, J., Gebauer, R., Giannitrapani, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, P., Jacon, O., Kalekin, D., Kranich, A., Laille, T., Lenisa, P., Liebing, E., Lindfor, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, F., Lucarelli, P., Majumdar, G., Maneva, K., Mannheim, M., Mariotti, M., Mart\inez, K., Mase, D., Mazin, C., Merck, M., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, L., Peruzzo, A., Piccioli, M., Pin, E., Prandini, J., Rico, W., Rhode, B., Riegel, M., Rissi, A., Robert, G., Rossato, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, and J., Zapatero

Subjects
RADIO-SOURCES, Active galactic nucleus, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Astrophysics::High Energy Astrophysical Phenomena, galaxies: individual (1ES 1959+650), TEV BLAZAR 1ES-1959+650, ACCELERATION, SENSITIVITY, NEUTRINOS, SPECTRA, OBJECTS, Flux, Astrophysics, Galaxies: Active, Gamma Rays: Observations, MAGIC (telescope), Cherenkov radiation, Physics, Observations [Gamma Rays], Gamma ray, HEGRA, Astronomy and Astrophysics, Light curve, Active [Galaxies], Crab Nebula, Space and Planetary Science, Electrónica, Física nuclear, Electricidad, individual (1ES 1959+650) [galaxies]
Abstract

The MAGIC Cerenkov telescope has observed very high energy (VHE) gamma-ray emission from the active galactic nucleus 1ES 1959+650 during 6 hr in 2004 September and October. The observations were carried out alternating with observations of the Crab Nebula, whose data were used as a reference source for optimizing gamma -ray/hadron separation and for flux comparison. The data analysis shows VHE gamma-ray emission of 1ES 1959+650 with similar to 8 sigma significance, at a time of low activity in both optical and X-ray wavelengths. An integral flux above similar to 180 GeV of about 20% that of the Crab Nebula was obtained. The light curve, sampled over 7 days, shows no significant variations. The differential energy spectrum between 180 GeV and 2 TeV can be fitted with a power-law of index -2.72 +/- 0.14. The spectrum is consistent with the slightly steeper spectrum seen by HEGRA at higher energies, also during periods of low X-ray activity.

Published
2006

2. Observations of Markarian 421 with the MAGIC Telescope

Author

Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Asensio, M., Baixeras, C., Barrio, J. A., Bartko, H., Bastieri, D., Becker, J., Bednarek, W., Berger, K., Bigongiari, C., Biland, A., Bock, R. K., Bordas, P., Bosch-Ramon, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Ciprini, S., Coarasa, J. A., Commichau, S., Contreras, J. L., Cortina, J., Curtef, V., Danielyan, V., Dazzi, F., De Angelis, A., De Los Reyes, R., De Lotto, B., Domingo-Santamaría, E., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Ferenc, D., Fernández, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Fuchs, M., Galante, N., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Höhne, D., Hose, J., Hsu, C. C., Jacon, P., Jogler, T., Kalekin, O., Kosyra, R., Kranich, D., Kritzer, R., Laatiaoui, M., Laille, A., Liebing, P., Lindfors, E., Lombardi, S., Longo, F., López, J., López, M., Lorenz, E., Majumdar, P., Maneva, G., Mannheim, K., Mansutti, O., Mariotti, M., Martínez, M., Mazin, D., Merck, C., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Ninkovic, J., Oña-Wilhelmi, E., Orduña, R., Otte, N., Oya, I., Paneque, D., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, D., Pauss, F., Pegna, R., Persic, M., Peruzzo, L., Piccioli, A., Poller, M., Prandini, E., Raymers, A., Rhode, W., Ribó, M., Rico, J., Rissi, M., Robert, A., Rügamer, S., Saggion, A., Sánchez, A., Sartori, P., Scalzotto, V., Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpää, A., Sobczynska, D., Stamerra, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Tonello, N., Torres, A., Torres, D. F., Turini, N., Vankov, H., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zanin, R., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J., Becker, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\ia, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, C. C., Hsu, P., Jacon, T., Jogler, O., Kalekin, R., Kosyra, D., Kranich, R., Kritzer, M., Laatiaoui, A., Laille, P., Liebing, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Mart\inez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, J., Ninkovic, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, E., Prandini, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, R., Zanin, and J., Zapatero

Subjects
Astrophysics::High Energy Astrophysical Phenomena, EXTRAGALACTIC BACKGROUND LIGHT, ACTIVE GALAXY MARKARIAN-421, TEV BLAZAR MARKARIAN-421, SPITZER-SPACE-TELESCOPE, DIFFUSE INFRARED LIGHT, HIGH-ENERGY PHOTONS, COBE DIRBE MAPS, BL-LAC OBJECTS, 1ST DETECTIONS, GAMMA-RAYS, Astrophysics, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, Power law, individual (Markarian 421) [BL Lacertae objects], law.invention, law, Blazar, Physics, Attenuation, BL Lacertae Objects: Individual: Name: Markarian 421 [Galaxies], observations [gamma rays], Quiescent state, Astronomy and Astrophysics, Synchrotron, Galaxies: BL Lacertae Objects: Individual: Name: Markarian 421, Extragalactic background light, Space and Planetary Science, Data analysis, Spectral energy distribution, Electrónica, Física nuclear, Gamma Rays: Observations, Electricidad
Abstract

The MAGIC telescope took data of very high energy ?-ray emission from the blazar Markarian 421 (Mrk 421) between 2004 November and 2005 April. We present a combined analysis of data samples recorded under different observational conditions, down to ?-ray energies of 100 GeV. The flux was found to vary between 0.5 and 2 crab (integrated above 200 GeV), considered a low state when compared to known data. Although the flux varied day by day, no short-term variability was observed, although there is some indication that not all nights show an equally quiescent state. The results at higher energies were found to be consistent with previous observations. A clear correlation is observed between ?-ray and X-ray fluxes, whereas no significant correlation between ?-ray and optical data is seen. The spectral energy distribution between 100 GeV and 3 TeV shows a clear deviation from a power law, more clearly and at lower flux than previous observations at higher energies. The deviation persists after correcting for the effect of attenuation by the extragalactic background light, and most likely is source-inherent. There is a rather clear indication of an inverse Compton peak around 100 GeV. The spectral energy distribution of Mrk 421 can be fitted by a one-zone synchrotron self-Compton model, suggesting once again a leptonic origin of the very high energy ?-ray emission from this blazar. ispartof: Astrophysical Journal vol:663 issue:1 pages:125-138 status: published

Published
2007
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3. Discovery of Very High Energy γ-Rays from Markarian 180 Triggered by an Optical Outburst

Author

Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Asensio, M., Baixeras, C., Barrio, J. A., Bartelt, M., Bartko, H., Bastieri, Denis, Bednarek, W., Berger, K., Bigongiari, C., Biland, A., Bisesi, E., Bock, R. K., Bordas, P., BOSCH RAMON, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Ciprini, S., Coarasa, J. A., Commichau, S., Contreras, J. L., Cortina, J., Curtef, V., Danielyan, V., Dazzi, Francesco, DE ANGELIS, A., DE LOS REYES, R., DE LOTTO, B., DOMINGO SANTAMARIA, E., Dorner, D., Doro, Michele, Errando, M., Fagiolini, M., Ferenc, D., Fernandez, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Fuchs, M., Galante, N., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Hohne, D., Hose, J., Hsu, C. C., Isar, P. G., Jacon, P., Kalekin, O., Kosyra, R., Kranich, D., Laatiaoui, M., Laille, A., Lenisa, T., Liebing, P., Lindfors, E., Lombardi, Saverio, Longo, F., Lopez, J., Lopez, M., Lorenz, E., Majumdar, P., Maneva, G., Mannheim, K., Mansutti, O., Mariotti, Mose', Martinez, M., Mase, K., Daniel, Mazin, Merck, C., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Ninkovic, J., ONA WILHELMI, E., Orduna, R., Otte, N., Oya, I., Paneque, D., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, Donatella, Pauss, F., Pavel, N., Pegna, R., Persic, M., Peruzzo, Luigi, Piccioli, A., Poller, M., Prandini, Elisa, Raymers, A., Rhode, W., Ribo, M., Rico, J., Riegel, B., Rissi, M., Robert, A., Rugamer, S., Saggion, Antonio, Sanchez, A., Sartori, Paolo, Scalzotto, VILLI MARIO, Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpaa, A., Sobczynska, D., Stamerra, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Tonello, N., Torres, A., Torres, D. F., Turini, N., Vankov, H., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zanin, R., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J., Becker, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\ia, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, C. C., Hsu, P., Jacon, O., Kalekin, R., Kosyra, D., Kranich, M., Laatiaoui, A., Laille, T., Lenisa, P., Liebing, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Mart\inez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, J., Ninkovic, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, E., Prandini, A., Raymer, W., Rhode, M., Ribo, J., Rico, B., Riegel, M., Rissi, A., Robert, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, R., Zanin, and J., Zapatero

Subjects
BL Lacertae objects : individual (Markarian 180), High energy, Photon, Astrophysics::High Energy Astrophysical Phenomena, individual (Markarian 180) [BL Lacertae objects], Flux, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Raigs gamma, Observacions astronòmiques, Target of opportunity, gamma rays : observations, BL Lacertae Objects: Individual: Name: Markarian 180 [Galaxies], Cosmic rays, Astrophysics::Galaxy Astrophysics, Galaxies: BL Lacertae Objects: Individual: Name: Markarian 180, Gamma Rays: Observations, Physics, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Observations [Gamma Rays], Gamma rays, Gamma ray, Astronomy and Astrophysics, Crab Nebula, Space and Planetary Science, Electrónica, Física nuclear, Astrophysics::Earth and Planetary Astrophysics, Electricidad, Astronomical observations, BL Lac object
Abstract

The high-frequency-peaked BL Lacertae object Markarian~180 (Mrk~180) was observed to have an optical outburst in 2006 March, triggering a Target of Opportunity observation with the MAGIC telescope. The source was observed for 12.4 hr and very high energy $\gamma$-ray emission was detected with a significance of 5.5 $\sigma$. An integral flux above 200 GeV of $(2.3\pm0.7)\times10^{-11} {cm}^{-2} {s}^{-1}$ was measured, corresponding to 11% of the Crab Nebula flux. A rather soft spectrum with a photon index of $-3.3\pm0.7$ has been determined. No significant flux variation was found., Comment: Accepted by ApJ Letters, minor revisions

Published
2006
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4. Observation of gamma rays from the galactic center with the MAGIC telescope

Author

Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Asensio, M., Baixeras, C., Barrio, J. A., Bartelt, M., Bartko, H., Bastieri, D., Bavikadi, R., Bednarek, W., Berger, K., Bigongiari, C., Biland, A., Bisesi, E., Bock, R. K., Bretz, T., Britvitch, I., Camara, M., Chilingarian, A., Ciprini, S., Coarasa, J. A., Commichau, S., Contreras, J. L., Cortina, J., Curtef, V., Danielyan, V., Dazzi, F., De Angelis, A., de los Reyes, R., De Lotto, B., Domingo Santamaría, E., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Ferenc, D., Fernández, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Galante, N., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Höhne, D., Hose, J., Jacon, P., Kalekin, O., Kranich, D., Laille, A., Lenisa, T., Liebing, P., Lindfors, E., Longo, F., López, J., López, M., Lorenz, E., Lucarelli, F., Majumdar, P., Maneva, G., Mannheim, K., Mariotti, M., Martínez, M., Mase, K., Mazin, D., Merck, M., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Oña Wilhelmi, E., Orduña, R., Otte, N., Oya, I., Paneque, D., Paoletti, R., Pasanen, M., Pascoli, D., Pauss, F., Pavel, N., Pegna, R., Peruzzo, L., Piccioli, A., Prandini, E., Rico, J., Rhode, W., Riegel, B., Rissi, M., Robert, A., Rügamer, S., Saggion, A., Sánchez, A., Sartori, P., Scalzotto, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpää, A., Sobczynska, D., Stamerra, Antonio, Stepanian, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Tonello, N., Torres, A., Torres, D. F., Turini, Nicola, Vankov, H., Vardanyan, A., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, M., Bartelt, H., Bartko, D., Bastieri, R., Bavikadi, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, R. K., Bock, T., Bretz, I., Britvitch, M., Camara, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\ia, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, P., Jacon, O., Kalekin, D., Kranich, A., Laille, T., Lenisa, P., Liebing, E., Lindfor, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, F., Lucarelli, P., Majumdar, G., Maneva, K., Mannheim, M., Mariotti, M., Mart\inez, K., Mase, D., Mazin, M., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, L., Peruzzo, A., Piccioli, E., Prandini, J., Rico, W., Rhode, B., Riegel, M., Rissi, A., Robert, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, A., Stepanian, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, A., Vardanyan, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, and J., Zapatero

Subjects
Astrofísica, High energy, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Astrophysics, Power law, Spectral line, Acceleration of Particles, Galaxy: Center, Gamma Rays: Observations, MAGIC (telescope), Physics, Center [Galaxy], Observations [Gamma Rays], Galactic Center, Astrophysics (astro-ph), Gamma ray, Astronomy and Astrophysics, Space and Planetary Science, Acceleration of Particle, Electrónica, Física nuclear, Electricidad, Energy (signal processing)
Abstract

Recently, the Galactic Center has been reported to be a source of very high energy (VHE) gamma-rays by the VERITAS, CANGAROO and HESS experiments. The energy spectra as measured by these experiments show substantial differences. In this Letter we present MAGIC observations of the Galactic Center, resulting in the detection of a differential gamma-ray flux consistent with a steady, hard-slope power law, described as dN/(dA dt dE) = (2.9+/-0.6)*10^{-12} (E/TeV)^{-2.2+/-0.2} cm^{-2}s^{-1}TeV^{-1}. The gamma-ray source is centered at (Ra, Dec)=(17h 45m 20s, -29deg 2'. This result confirms the previous measurements by the HESS experiment and indicates a steady source of TeV gamma-rays. We briefly describe the observational technique used, the procedure implemented for the data analysis, and discuss the results in the perspective of different models proposed for the acceleration of the VHE gamma-rays., ApJL submitted

Published
2006

5. Observation of VHE Gamma Radiation from HESS J1834-087/W41 with the MAGIC Telescope

Author

Albert, J, Aliu, E, Anderhub, H, Antoranz, P, Armada, A, Asensio, M, Baixeras, C, Barrio, Ja, Bartelt, M, Bartko, H, Bastieri, D, Bavikadi, Sr, Bednarek, W, Berger, K, Bigongiari, C, Biland, A, Bisesi, E, Bock, Rk, Bordas, P, Bosch Ramon, V, Bretz, T, Britvitch, I, Camara, M, Carmona, E, Chilingarian, A, Ciprini, S, Coarasa, Ja, Commichau, S, Contreras, Jl, Cortina, J, Curtef, V, Dame, Tm, Danielyan, V, Dazzi, F, DE ANGELIS, Alessandro, Reyes, Rdl, DE LOTTO, Barbara, Domingo Santamari, E, Dorner, D, Doro, M, Errando, M, Fagiolini, M, Ferenc, D, Fernandez, E, Firpo, R, Flix, J, Fonseca, Mv, Font, L, Fuchs, M, Galante, N, Garczarczyk, M, Gaug, M, Giller, M, Goebel, F, Hakobyan, D, Hayashida, M, Hengstebeck, T, Hohne, D, Hose, J, Hsu, Cc, Isar, Pg, Jacon, P, Kalekin, O, Kasyra, R, Kranich, D, Laatiaoui, M, Laille, A, Lenisa, T, Liebing, P, Lindfors, E, Lombardi, S, Longo, F, Lopez, J, Lopez, M, Lorenz, E, Lucarelli, F, Majumdar, P, Maneva, G, Mannheim, K, Mansutti, O, Mariotti, M, Martinez, M, Mase, K, Mazin, D, Merck, C, Meucci, M, Meyer, M, Miranda, Jm, Mirzoyan, R, Mizobuchi, S, Moralejo, A, Nilsson, K, Ona Wilhelmi, E, Orduna, R, Otte, N, Oya, I, Paneque, D, Paoletti, R, Paredes, Jm, Pasanen, M, Pascoli, D, Pauss, F, Pavel, N, Pegna, R, Persic, M, Peruzzo, L, Piccioli, A, Poller, M, Prandini, E, Raymers, A, Rico, J, Rhode, W, Ribo, M, Riegel, B, Rissi, M, Robert, A, Rugamer, S, Saggion, A, Sanchez, A, Sartori, P, Scalzotto, V, Scapin, V, Schmitt, R, Schweizer, T, Shayduk, M, Shinozaki, K, Shore, Sn, Sidro, N, Sillanpaa, A, Sobczynska, D, Stamerra, A, Stark, Ls, Takalo, L, Temnikov, P, Tescaro, D, Teshima, M, Tonello, N, Torres, A, Torres, Df, Turini, N, Vankov, H, Vitale, V, Wagner, Rm, Wibig, T, Wittek, W, Zanin, R, Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, M., Bartelt, H., Bartko, D., Bastieri, S. R., Bavikadi, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, T. M., Dame, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\i, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, C. C., Hsu, P. G., Isar, P., Jacon, O., Kalekin, R., Kasyra, D., Kranich, M., Laatiaoui, A., Laille, T., Lenisa, P., Liebing, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, F., Lucarelli, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Mart\inez, K., Mase, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, E., Prandini, A., Raymer, J., Rico, W., Rhode, M., Ribo, B., Riegel, M., Rissi, A., Robert, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, R., Zanin, and J., Zapatero

Subjects
ISM: cosmic rays, Observation [Gamma Rays], Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Gamma Rays: Observations, ISM: Supernova Remnants, Astrophysics, Radiation, Power law, Supernova Remnants [ISM], Superposition principle, Raigs gamma, Coincident, MAGIC (telescope), Astrophysics::Galaxy Astrophysics, supernova remnants, Physics, Molecular cloud, Gamma rays, Astrophysics (astro-ph), observations [gamma rays], Astronomy and Astrophysics, Galactic plane, Space and Planetary Science, Electrónica, Física nuclear, Electricidad
Abstract

Recently, the HESS array has reported the detection of gamma-ray emission above a few hundred GeV from eight new sources located close to the Galactic Plane. The source HESS J1834-087 is spatially coincident with SNR G23.3-0.3 (W41). Here we present MAGIC observations of this source, resulting in the detection of a differential gamma-ray flux consistent with a power law, described as dN/(dA dt dE) = (3.7 +/- 0.6)*10^(-12) (E/TeV)^(-2.5 +/- 0.2) \ cm^(-2)s^(-1)TeV^(-1). We confirm the extended character of this flux. We briefly discuss the observational technique used, the procedure implemented for the data analysis, and put this detection in the perspective of the molecular environment found in the region of W41. We present 13CO and 12CO emission maps showing the existence of a massive molecular cloud in spatial superposition with the MAGIC detection., Comment: Accepted by ApJ Letters

Published
2006
Full Text
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6. Discovery of very high energy gamma rays from 1ES 1218+30.4

Author

J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, M. Asensio, C. Baixeras, J. A. Barrio, M. Bartelt, H. Bartko, D. Bastieri, S. R. Bavikadi, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, E. Bisesi, R. K. Bock, T. Bretz, I. Britvitch, M. Camara, A. Chilingarian, S. Ciprini, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, V. Curtef, V. Danielyan, F. Dazzi, A. De Angelis, R. de los Reyes, B. De Lotto, E. Domingo-Santamaría, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, R. Firpo, J. Flix, M. V. Fonseca, L. Font, N. Galante, M. Garczarczyk, M. Gaug, M. Giller, F. Goebel, D. Hakobyan, M. Hayashida, T. Hengstebeck, D. Höhne, J. Hose, P. Jacon, O. Kalekin, D. Kranich, A. Laille, T. Lenisa, P. Liebing, E. Lindfors, F. Longo, J. López, M. López, E. Lorenz, F. Lucarelli, P. Majumdar, G. Maneva, K. Mannheim, M. Mariotti, M. Martínez, K. Mase, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, A. Moralejo, K. Nilsson, E. Oña-Wilhelmi, R. Orduña, N. Otte, I. Oya, D. Paneque, R. Paoletti, M. Pasanen, D. Pascoli, F. Pauss, N. Pavel, R. Pegna, M. Persic, L. Peruzzo, A. Piccioli, M. Poller, E. Prandini, W. Rhode, J. Rico, B. Riegel, M. Rissi, A. Robert, S. Rügamer, A. Saggion, A. Sánchez, P. Sartori, V. Scalzotto, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, S. N. Shore, N. Sidro, A. Sillanpää, D. Sobczyńska, A. Stamerra, L. S. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, N. Tonello, A. Torres, D. F. Torres, N. Turini, H. Vankov, A. Vardanyan, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, J. Zapatero, J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, M., Bartelt, H., Bartko, D., Bastieri, S. R., Bavikadi, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, R. K., Bock, T., Bretz, I., Britvitch, M., Camara, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\ia, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, P., Jacon, O., Kalekin, D., Kranich, A., Laille, T., Lenisa, P., Liebing, E., Lindfor, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, F., Lucarelli, P., Majumdar, G., Maneva, K., Mannheim, M., Mariotti, M., Mart\inez, K., Mase, D., Mazin, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, E., Prandini, W., Rhode, J., Rico, B., Riegel, M., Rissi, A., Robert, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, A., Vardanyan, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, and J., Zapatero

Subjects
BL Lacertae objects: individual (1ES 1218+30.4), Gamma Rays: Observations, Astrophysics, 01 natural sciences, Power law, law.invention, Telescope, law, individual (1ES 1218+30.4) [BL Lacertae objects], 0103 physical sciences, Energy spectrum, 010303 astronomy & astrophysics, Cherenkov radiation, Gamma Rays: Observation, Physics, 010308 nuclear & particles physics, Observations [Gamma Rays], Gamma ray, Astronomy, Astronomy and Astrophysics, Redshift, Space and Planetary Science, Electrónica, Física nuclear, Electricidad
Abstract

The MAGIC collaboration has studied the high-frequency-peaked BL Lac object 1ES 1218 + 30.4, at a redshift z = 0.182, using the MAGIC imaging air Cerenkov telescope located on the Canary Island of La Palma. A gamma-ray signal was observed with 6.4 sigma significance. The differential energy spectrum for an energy threshold of 120 GeV can be fitted by a simple power law, yielding F-E = (8.1 +/- 2.1) x 10(-7)[E/(250 GeV)](-3.0 +/- 0.4) TeV-1 F (E) m(-2) s(-1). During the 6 days of observation in 2005 January, no time variability on timescales of days was found within the statistical errors. The observed integral flux above 350 GeV is nearly a factor of 2 below the upper limit reported by the Whipple collaboration in 2003.

Published
2006

7. Flux upper limit on gamma-ray emission by GRB 050713a from magic telescope observations

Author

J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, M. Asensio, C. Baixeras, J. A. Barrio, M. Bartelt, H. Bartko, D. Bastieri, R. Bavikadi, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, E. Bisesi, R. K. Bock, T. Bretz, I. Britvitch, M. Camara, A. Chilingarian, S. Ciprini, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, V. Curtef, V. Danielyan, F. Dazzi, A. De Angelis, R. de los Reyes, B. De Lotto, E. Domingo-Santamaría, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, R. Firpo, J. Flix, M. V. Fonseca, L. Font, N. Galante, M. Garczarczyk, M. Gaug, M. Giller, F. Goebel, D. Hakobyan, M. Hayashida, T. Hengstebeck, D. Höhne, J. Hose, P. Jacoń, O. Kalekin, D. Kranich, A. Laille, T. Lenisa, P. Liebing, E. Lindfors, F. Longo, J. López, M. López, E. Lorenz, F. Lucarelli, P. Majumdar, G. Maneva, K. Mannheim, M. Mariotti, M. Martínez, K. Mase, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, A. Moralejo, K. Nilsson, E. Oña-Wilhelmi, R. Orduña, N. Otte, I. Oya, D. Paneque, R. Paoletti, M. Pasanen, D. Pascoli, F. Pauss, N. Pavel, R. Pegna, M. Persic, L. Peruzzo, A. Piccioli, E. Prandini, W. Rhode, J. Rico, B. Riegel, M. Rissi, A. Robert, S. Rügamer, A. Saggion, A. Sánchez, P. Sartori, V. Scalzotto, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, S. Shore, N. Sidro, A. Sillanpää, D. Sobczyńska, A. Stamerra, L. S. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, N. Tonello, A. Torres, D. F. Torres, N. Turini, H. Vankov, A. Vardanyan, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, J. Zapatero, J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, M., Bartelt, H., Bartko, D., Bastieri, R., Bavikadi, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, R. K., Bock, T., Bretz, I., Britvitch, M., Camara, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\ia, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, P., Jacon, O., Kalekin, D., Kranich, A., Laille, T., Lenisa, P., Liebing, E., Lindfor, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, F., Lucarelli, P., Majumdar, G., Maneva, K., Mannheim, M., Mariotti, M., Mart\inez, K., Mase, D., Mazin, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, E., Prandini, W., Rhode, J., Rico, B., Riegel, M., Rissi, A., Robert, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, A., Vardanyan, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, and J., Zapatero

Subjects
Physics, Twilight, Observation [Gamma Rays], Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Gamma Rays: Bursts, Gamma Rays: Observations, Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Very High Energy Gamma-ray Astronomy, Redshift, Space and Planetary Science, Electrónica, Física nuclear, MAGIC (telescope), Burst [Gamma Rays], Electricidad, Gamma-ray burst
Abstract

The long-duration GRB050713a was observed by the MAGIC Telescope, 40 seconds after the burst onset, and followed up for 37 minutes, until twilight. The observation, triggered by a SWIFT alert, covered energies above ~175 GeV. Using standard MAGIC analysis, no evidence for a gamma signal was found. As the redshift of the GRB was not measured directly, the flux upper limit, estimated by MAGIC, is still compatible with the assumption of an unbroken power-law spectrum extending from a few hundred keV to our energy range., Comment: 14 pages, 4 figures, submitted to ApJ

Published
2006

8. MAGIC observations of very high energy gamma-rays from HESS J1813-178

Author

J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, M. Asensio, C. Baixeras, J. A. Barrio, M. Bartel, H. Bartko, D. Bastieri, R. Bavikadi, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, E. Bisesi, O. Blanch, R. K. Bock, T. Bretz, I. Britvitch, M. Camara, A. Chilingarian, S. Ciprini, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, V. Curtev, V. Danielyan, F. Dazzi, A. De Angelis, R. de los Reyes, B. De Lotto, E. Domingo-Santamaria, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, R. Firpo, J. Flix, M. V. Fonseca, L. Font, N. Galante, M. Garczarczyk, M. Gaug, J. Gebauer, M. Giller, F. Goebel, D. Hakobyan, M. Hayashida, T. Hengstebeck, D. Höhne, J. Hose, P. Jacon, O. Kalekin, D. Kranich, A. Laille, T. Lenisa, P. Liebing, E. Lindfors, F. Longo, M. López, J. López, E. Lorenz, F. Lucarelli, P. Majumdar, G. Maneva, K. Mannheim, M. Mariotti, M. Martínez, K. Mase, D. Mazin, C. Merck, M. Merck, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, A. Moralejo, K. Nilsson, E. Oña-Wilhelmi, R. Orduña, N. Otte, I. Oya, D. Paneque, R. Paoletti, M. Pasanen, D. Pascoli, F. Pauss, N. Pavel, R. Pegna, L. Peruzzo, A. Piccioli, E. Prandini, J. Rico, W. Rhode, B. Riegel, M. Rissi, A. Robert, G. Rossato, S. Rügamer, A. Saggion, A. Sanchez, P. Sartori, V. Scalzotto, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, S. Shore, N. Sidro, A. Sillanpää, D. Sobczynska, A. Stamerra, L. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, N. Tonello, A. Torres, D. F. Torres, N. Turini, H. Vankov, V. Vitale, R. Wagner, T. Wibig, W. Wittek, J. Zapatero, J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, M., Bartel, H., Bartko, D., Bastieri, R., Bavikadi, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, O., Blanch, R. K., Bock, T., Bretz, I., Britvitch, M., Camara, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtev, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamaria, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, N., Galante, M., Garczarczyk, M., Gaug, J., Gebauer, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, P., Jacon, O., Kalekin, D., Kranich, A., Laille, T., Lenisa, P., Liebing, E., Lindfor, Longo, Francesco, M., Lopez, J., Lopez, E., Lorenz, F., Lucarelli, P., Majumdar, G., Maneva, K., Mannheim, M., Mariotti, M., Mart\inez, K., Mase, D., Mazin, C., Merck, M., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, L., Peruzzo, A., Piccioli, E., Prandini, J., Rico, W., Rhode, B., Riegel, M., Rissi, A., Robert, G., Rossato, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R., Wagner, T., Wibig, W., Wittek, and J., Zapatero

Subjects
Astrofísica, High energy, Observation [Gamma Rays], Acceleration of Particles, Gamma Rays: Observations, ISM: Supernova Remnants, FOS: Physical sciences, Astrophysics, Power law, Supernova Remnants [ISM], Coincident, Cosmic rays, Physics, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Astrophysics (astro-ph), Magic (programming), Gamma ray, Astronomy and Astrophysics, Galactic plane, Space and Planetary Science, Acceleration of Particle, Electrónica, Física nuclear, Electricidad, acceleration of particles
Abstract

Recently, the HESS collaboration has reported the detection of gamma-ray emission above a few hundred GeV from eight new sources located close to the Galactic Plane. The source HESS J1813-178 has sparked particular interest, as subsequent radio observations imply an association with SNR G12.82-0.02. Triggered by the detection in VHE gamma-rays, a positionally coincident source has also been found in INTEGRAL and ASCA data. In this Letter we present MAGIC observations of HESS J1813-178, resulting in the detection of a differential gamma-ray flux consistent with a hard-slope power law, described as dN/(dA dt dE) = (3.3+/-0.5)*10^{-12} (E/TeV)^{-2.1+/-0.2} cm^(-2)s^(-1)TeV^(-1). We briefly discuss the observational technique used, the procedure implemented for the data analysis, and put this detection in the perspective of multifrequency observations., Accepted by ApJ Letters

Published
2006

9. Physics and astrophysics with a ground-based gamma-ray telescope of low energy threshold

Author

V. Scalzotto, V. Danielyan, M. Pin, Thomas Bretz, Francesco Longo, W. Wittek, O. C. de Jager, Miriam Lucio Martinez, Jose Flix, Ll. Font, Josue J. Lopez, E. Fernandez, F. Lucarelli, N. Otte, R. Giannitrapani, Stefano Ciprini, Oscar Blanch, A. Robert, N. Tonello, R. Orduña, Jose Luis Contreras, M. V. Fonseca, Juan Cortina, V. Vitale, Riccardo Paoletti, K. Mase, E. Lorenz, P. Sartori, Daniel Ferenc, T. Hengstebeck, E. Ona-Wilhelmi, E. Bisesi, Ciro Bigongiari, Antonio Stamerra, Francesco Dazzi, M. Pasanen, S. Commichau, Denis Bastieri, J. Albert i Fort, Dorota Sobczyńska, Felicitas Pauss, T. Lenisa, A. Sillanpää, R. Firpo, M. Meyer, Daniela Dorner, Elina Lindfors, M. Merck, Daniel Mazin, B. De Lotto, A. Torres, G. Rossato, M. Garczarczyk, Karl Mannheim, D. Kranich, M. A. Lopez, Dieter Renker, H. Bartko, R. G. Pegna, K. Shinozaki, M. Gaug, Abelardo Moralejo, A. Laille, L. Peruzzo, Tadeusz Wibig, W. Bednarek, Ashot Chilingarian, O. Kalekin, Mario Meucci, J. Gebauer, C. Merck, A. Sánchez, G. Viertel, T. Schweizer, P. Jacon, R. de los Reyes, Nicola Turini, D. Pascoli, R. Mirzoyan, A. Saggion, Adrian Biland, J. Rico, Maria Giller, L. S. Stark, S. Mizobuchi, N. Pavel, S. Volkov, R. K. Bock, Masahiro Teshima, C. Baixeras, O. Epler, E. Domingo, David Paneque, Robert Wagner, Michele Doro, M. Shayduk, A. De Angelis, A. Piccioli, Nicola Galante, A. Armada, Mosè Mariotti, Florian Goebel, L. O. Takalo, J. A., I., A., Armada, C., Baixera, H., Bartko, D., Bastieri, W., Bednarek, C., Bigongiari, A., Biland, E., Bisesi, O., Blanch, R. K., Bock, T., Bretz, A., Chilingarian, S., Ciprini, S., Commichau, J. L., Contrera, J., Cortina, V., Danielyan, F., Dazzi, Angelis, A., Lotto, B., E., Domingo, D., Dorner, M., Doro, O., Epler, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, N., Galante, M., Garczarczyk, M., Gaug, J., Gebauer, R., Giannitrapani, M., Giller, F., Goebel, T., Hengstebeck, P., Jacon, O. C., De, O., Kalekin, D., Kranich, A., Laille, T., Lenisa, E., Lindfor, Longo, Francesco, M., Lopez, J., Lopez, E., Lorenz, F., Lucarelli, K., Mannheim, M., Mariotti, M., Martinez, K., Mase, D., Mazin, C., Merck, M., Merck, M., Meucci, M., Meyer, R., Mirzoyan, S., Mizobuchi, A., Moralejo, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, D., Paneque, R., Paoletti, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, L., Peruzzo, A., Piccioli, M., Pin, Los, R., J., Rico, D., Renker, A., Robert, G., Rossato, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, T., Schweizer, M., Shayduk, K., Shinozaki, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L., Stark, L., Takalo, M., Teshima, N., Tonello, A., Torre, N., Turini, G., Viertel, V., Vitale, S., Volkov, R., Wagner, T., Wibig, and W., Wittek

Subjects
Physics, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Cosmic rays, CHERENKOV TELESCOPE, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, low-energy gamma-ray, Cherenkov telescope, Astrophysics, Cosmology, Astronomy and Astrophysics, Observable, Cosmic ray, Gamma-ray astronomy, Cherenkov Telescope Array, Very High Energy Gamma-ray Astronomy, Satellite, Cherenkov radiation, Fermi Gamma-ray Space Telescope
Abstract

Ground-based Cherenkov telescopes have made in recent years important contributions to high energy gamma-ray astronomy. A lower energy threshold, considerably below 100 GeV, and improved sensitivity will be key parameters to extend their role. A lower threshold will permit these instruments to cover wavelengths with good overlap with satellite experiments, thus providing essential complementary information. The latest generation of Imaging Air Cherenkov Telescopes was built with this criterion in mind. Preliminary studies concerning further progress in the same direction have started. We discuss in this contribution the astrophysics and physics arguments for lowering the observable energy threshold as far as the Cherenkov technique permits, and the ensuing complementarity to results obtained with a GLAST-like satellite.

Published
2005

10. The MAGIC telescope for gamma-ray astronomy above 30 GeV

Author

Moralejo, A., Baixeras, C., Bastieri, D., Bednarek, W., Bigongiari, C., Biland, A., Blanch, O., Böck, R., Bretz, T., Chilingarian, A., Coarasa, J. A., Colombo, E., Commichau, S., Contreras, J. L., Cortina, J., Angelis, A., Los Reyes, R., Lotto, B., Domingo, C., Domingo, E., Dorner, D., Ferenc, D., Fernández, E., Flix, J., Fonseca, V., Font, L., Galante, N., Gaug, M., Garczarczyk, M., Gebauer, J., Giannitrapani, R., Giller, M., Goebel, F., Hengstebeck, T., Jacon, P., Jager, O. C., Kalekin, O., Kestel, M., Kim, K. -S, Kneiske, T., Laatiaoui, M., Laille, A., Lindfors, E., Longo, F., López, M., López, J., Lorenz, E., Lucarelli, F., Mannheim, K., Mariotti, M., Martínez, M., Mase, K., Merck, M., Meucci, M., Mirzoyan, R., Mizobuchi, S., Oña-Wilhelmi, E., Orduña, R., Paneque, D., Paoletti, R., Pasanen, M., Pascoli, D., Pauss, F., Pavel, N., Pegna, R., Peruzzo, L., Piccioli, A., Pin, M., Robert, A., Saggion, A., Sánchez, A., Sartori, P., Scalzotto, V., Shinozaki, K., Sillanpaa, A., Sobczynska, D., Antonio Stamerra, Stark, L. S., Stepanian, A., Stiehler, R., Takalo, L., Teshima, M., Tonello, N., Torres, A., Turini, N., Viertel, G., Vitale, V., Volkov, S., Wagner, R., Wibig, T., Wittek, W., A., Moralejo, C., Baixera, D., Bastieri, W., Bednarek, C., Bigongiari, A., Biland, O., Blanch, R., B\ock, T., Bretz, A., Chilingarian, J. A., Coarasa, E., Colombo, S., Commichau, J. L., Contrera, J., Cortina, Angelis, A., Los, R., Lotto, B., C., Domingo, E., Domingo, D., Dorner, D., Ferenc, E., Fernandez, J., Flix, V., Fonseca, L., Font, N., Galante, M., Gaug, M., Garczarczyk, J., Gebauer, R., Giannitrapani, M., Giller, F., Goebel, T., Hengstebeck, P., Jacon, O. C., De, O., Kalekin, M., Kestel, K., Kim, T., Kneiske, M., Laatiaoui, A., Laille, E., Lindfor, Longo, Francesco, M., Lopez, J., Lopez, E., Lorenz, F., Lucarelli, K., Mannheim, M., Mariotti, M., Mart\inez, K., Mase, M., Merck, M., Meucci, R., Mirzoyan, S., Mizobuchi, E., O\~na Wilhelmi, R., Ordu\~na, D., Paneque, R., Paoletti, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, L., Peruzzo, A., Piccioli, M., Pin, A., Robert, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, K., Shinozaki, A., Sillanpaa, D., Sobczynska, A., Stamerra, L. S., Stark, A., Stepanian, R., Stiehler, L., Takalo, M., Teshima, N., Tonello, A., Torre, N., Turini, G., Viertel, V., Vitale, S., Volkov, R., Wagner, T., Wibig, and W., Wittek

Subjects
HIGH-ENERGY, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics, miscellaneous [techniques], MARKARIAN-421, law.invention, Telescope, Pulsar, Observatory, law, Astrophysics::Solar and Stellar Astrophysics, MAGIC (telescope), OUTBURST, Astrophysics::Galaxy Astrophysics, Physics, MKN 501, SYSTEM, HEGRA, instrumentation: detectors, detector [instrumentation], Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Gamma-ray astronomy, techniques: miscellaneous, Supernova, Space and Planetary Science, Fermi Gamma-ray Space Telescope
Abstract

The MAGIC telescope, presently at its commissioning phase, will become fully operative by the end of 2003. Placed at the Roque de los Muchachos Observatory (ORM) on the island of La Palma, MAGIC is the largest among new generation ground-based gamma ray telescopes, and will reach an energy threshold as low as 30 GeV. The range of the electromagnetic spectrum between 10 and 250 GeV remains to date mostly unexplored. Observations in this energy region are expected to provide key data for the understanding of a wide variety of astrophysical phenomena belonging to the so-called ``non thermal Universe'', like the processes in the nuclei of active galaxies, the radiation mechanisms of pulsars and supernova remnants, and the enigmatic gamma-ray bursts. An overview of the telescope and its physics goals is presented.

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