2026-06-07T15:18:46Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/438922024-09-05T17:31:38Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Antoranz Canales, Pedro author Barrio Uña, Juan Abel author Contreras González, José Luis author Fonseca González, María Victoria author López Moya, Marcos author Miranda Pantoja, José Miguel 2023-06-20T03:33:57Z 2023-06-20T03:33:57Z 2011-06 0004-6361 10.1051/0004-6361/201116497 https://hdl.handle.net/20.500.14352/43892 http://arxiv.org/abs/1101.2522 http://arxiv.org/ Context. 3C 279, the first quasar discovered to emit VHE gamma-rays by the MAGIC telescope in 2006, was reobserved by MAGIC in January 2007 during a major optical flare and from December 2008 to April 2009 following an alert from the Fermi space telescope on an exceptionally high gamma-ray state. Aims. The January 2007 observations resulted in a detection on January 16 with significance 5.4 sigma, corresponding to a F (>150 GeV) (3.8 +/- 0.8) x 10(-11) ph cm(-2) s(-1) while the overall data sample does not show significant signal. The December 2008-April 2009 observations did not detect the source. We study the multiwavelength behaviour of the source at the epochs of MAGIC observations, collecting quasi-simultaneous data at optical and X-ray frequencies and for 2009 also gamma-ray data from Fermi. Methods. We study the light curves and spectral energy distribution of the source. The spectral energy distributions of three observing epochs (including the February 2006, which has been previously published) are modelled with one-zone inverse Compton models and the emission on January 16, 2007 also with two zone model and with a lepto-hadronic model. Results. We find that the VHE gamma-ray emission detected in 2006 and 2007 challenges standard one-zone model, based on relativistic electrons in a jet scattering broad line region photons, while the other studied models fit the observed spectral energy distribution more satisfactorily. eng MAGIC observations and multiwavelength properties of the quasar 3C 279 in 2007 and 2009 journal article URL https://docta.ucm.es/bitstreams/ed2fead8-2bee-4e05-891f-a955994ae2fd/download File MD5 dfd3bff56e039c10c3f1e7537580278c 354565 application/pdf MirandaJM19preprint.pdf URL https://docta.ucm.es/bitstreams/a8f4ccd6-4e30-46f9-addd-5286e6abd0c8/download File MD5 e14f2851d5b7ad8016ab2b90db3d33cf 66047 text/plain MirandaJM19preprint.pdf.txt