Discovery of a very high energy gamma-ray signal from the 3C 66A/B region

Details Discovery of a very high energy gamma-ray signal from the 3C 66A/B region Discovery of a very high energy gamma-ray signal from the 3C 66A/B region

2008-10-26

arxiv.org/abs/0810.4712v3

Astrophysical Journal Letters 692 (2009) 29-33

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, accepted for publication in ApJL. Small corrections

Scientific paper

10.1088/0004-637X/692/1/L29

The MAGIC telescope observed the region around the distant blazar 3C 66A for 54.2 h in 2007 August-December. The observations resulted in the discovery of a gamma-ray source at energies above 150 GeV centered at celestial coordinates RA=2h23m12s and DEC=43deg0.7' (MAGIC J0223+430), coinciding with the nearby radio galaxy 3C 66B. A possible association of the excess with the blazar 3C 66A is discussed. The energy spectrum of MAGIC J0223+430 follows a power law with a normalization of (1.7+-0.3_(stat)+-0.6_(syst)) 10^(-11) TeV^(-1)cm^(-2)s^(-1) at 300 GeV and a photon index Gamma=-3.10+-0.31_(stat)+-0.2_(syst). No significant variability of the signal was found during the observation period.

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