1. MAGIC discovery of Very High Energy Emission from the FSRQ PKS 1222+21
- Author
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Aleksic, J., Antonelli, L.-A., Antoranz, P., Backes, M., Barrio, J. A., Bastieri, D., Becerra González, J., Bednarek, W., Berdyugin, A., Berger, K., Bernardini, E., Hadasch, D., Häfner, D., Herrero, A., Hildebrand, D., Höhne-Mönch, D., Hose, J., Hrupec, D., Huber, B., Jogler, T., Klepser, S., Prada, F., Krähenbühl, T., Krause, J., La Barbera, A., Lelas, D., Leonardo, E., Lindfors, E., Lombardi, S., López, M., Lorenz, E., MAGIC Collaboration, Prada Moroni, P. G., Makariev, M., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Meucci, M., Miranda, J. M., Prandini, E., Mirzoyan, R., Miyamoto, H., Moldón, J., Moralejo, A., Nieto, D., Nilsson, K., Orito, R., Oya, I., Paneque, D., Paoletti, R., Puljak, I., Pardo, S., Paredes, J. M., Partini, S., Pasanen, M., Pauss, F., Perez-Torres, M. A., Persic, M., Peruzzo, L., Pilia, M., Pochon, J., Reichardt, I., Reinthal, R., Rhode, W., Ribó, M., Rico, J., Rügamer, S., Biland, A., Saggion, A., Saito, K., Saito, T. Y., Salvati, M., Satalecka, K., Scalzotto, V., Scapin, V., Schultz, C., Schweizer, T., Shayduk, M., Blanch, O., Shore, S. N., Sillanpää, A., Sitarek, J., Sobczynska, D., Spanier, F., Spiro, S., Stamerra, A., Steinke, B., Storz, J., Strah, N., Bock, R. K., Suric, T., Takalo, L., Tanaka, Y. T., Tavecchio, F., Temnikov, P., Terzic, T., Tescaro, D., Teshima, M., Thom, M., Tibolla, O., Boller, A., Torres, D. F., Treves, A., Vankov, H., Vogler, P., Wagner, R. M., Weitzel, Q., Wood, D. L., Zabalza, V., Zandanel, F., Zanin, R., Bonnoli, G., Borla Tridon, D., Braun, I., Bretz, T., Buson, S., Cañellas, A., Carmona, E., Carosi, A., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Cossio, L., Covino, S., Dazzi, F., De Angelis, A., De Cea del Pozo, E., Delgado Mendez, C., De Lotto, B., Diago Ortega, A., Doert, M., Domínguez, A., Dominis Prester, D., Dorner, D., Doro, M., Elsaesser, D., Ferenc, D., Fonseca, M. V., Font, L., Fruck, C., García López, R. J., Garczarczyk, M., Garrido, D., Giavitto, G., Godinovic, N., and Universitat de Barcelona
- Subjects
ACTIVE GALACTIC NUCLEI ,Raigs còsmics ,Astrophysics::High Energy Astrophysical Phenomena ,galaxies: active ,Flux ,Astrophysics ,cosmic background radiation ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,7. Clean energy ,galaxies: jets ,gamma rays: galaxies ,quasars: individual: PKS 1222+21 ,Spectral line ,UPPER LIMITS ,0103 physical sciences ,SPECTRA ,MAGIC (telescope) ,010303 astronomy & astrophysics ,Cosmic rays ,Quasars ,Cherenkov radiation ,Quàsars ,Physics ,010308 nuclear & particles physics ,GAMMA-RAY ABSORPTION ,CONSTRAINTS ,Astronomy and Astrophysics ,Quasar ,BLAZARS ,3C 279 ,EXTRAGALACTIC BACKGROUND LIGHT ,Crab Nebula ,Extragalactic background light ,13. Climate action ,Space and Planetary Science ,Galàxies actives ,Active galaxies ,RELATIVISTIC JETS ,RADIATION ,ddc:520 ,High Energy Physics::Experiment ,Electrónica ,Física nuclear ,Electricidad ,Fermi Gamma-ray Space Telescope - Abstract
Very high energy (VHE) gamma-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+ 21 (4C 21.35, z = 0.432) was detected with the MAGIC Cherenkov telescopes during a short observation (similar to 0.5 hr) performed on 2010 June 17. The MAGIC detection coincides with high-energy MeV/ GeV gamma-ray activity measured by the Large Area Telescope (LAT) on board the Fermi satellite. The VHE spectrum measured by MAGIC extends from about 70 GeV up to at least 400 GeV and can be well described by a power-law dN/dE proportional to E-Gamma with a photon index Gamma = 3.75 +/- 0.27(stat) +/- 0.2(syst). The averaged integral flux above 100 GeV is (4.6 +/- 0.5) x 10(-10) cm(-2) s(-1) (similar to 1 Crab Nebula flux). The VHE flux measured by MAGIC varies significantly within the 30 minute exposure implying a flux doubling time of about 10 minutes. The VHE and MeV/GeV spectra, corrected for the absorption by the extragalactic background light (EBL), can be described by a single power law with photon index 2.72 +/- 0.34 between 3 GeV and 400 GeV, and is consistent with emission belonging to a single component in the jet. The absence of a spectral cutoff constrains the gamma-ray emission region to lie outside the broad-line region, which would otherwise absorb the VHE gamma-rays. Together with the detected fast variability, this challenges present emission models from jets in FSRQs. Moreover, the combined Fermi/LAT and MAGIC spectral data yield constraints on the density of the EBL in the UV-optical to near-infrared range that are compatible with recent models.
- Published
- 2011
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