2009/07/01 by E. Prandini, Daniela Dorner, Prandini, Elisa +7
Engineering · Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Gamma-ray bursts and supernovae #High Energy Astrophysical Phenomena (astro-ph.HE) #Particle Accelerators and Free-Electron Lasers
paper · pdf · doi:10.48550/arxiv.0907.0157
openalex publication_date 2009/07/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Very high energy gamma ray emission from the active galactic nucleus PG\n1553+113 was observed during 2005 and 2006 by the MAGIC collaboration, for a\ntotal observation time of 18.8 hours. Here we present the results of follow up\nobservations: more than 20 hours of good quality data collected by the MAGIC\nTelescope during the 2007 and 2008 campaigns. The obtained spectra are compared\nand combined with previous measurements, and corrected for absorption adopting\ndifferent EBL models. Upper limits on the unknown source redshift are derived\nby assuming the absence of a break in the intrinsic spectrum, or alternatively\nby constraining the hardness of the intrinsic source spectrum.\n