Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 723, Issue 2, Pages L207-L212Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/723/2/L207
Keywords
galaxies: active; galaxies: individual (IC 310); gamma rays: galaxies
Categories
Funding
- INFN Padova
- German BMBF
- Italian INFN
- Swiss National Fund SNF
- Spanish MICINN
- Marie Curie program
- Spanish Consolider-Ingenio [CSD2007-00042, CSD2009-00064]
- Bulgarian NSF [DO02-353]
- Academy of Finland [127740]
- YIP of the Helmholtz Gemein-schaft
- DFG
- Polish MNiSzW [N N203 390834]
- National Aeronautics and Space Administration
- MPG
- Grants-in-Aid for Scientific Research [22840030] Funding Source: KAKEN
- Academy of Finland (AKA) [127740, 127740] Funding Source: Academy of Finland (AKA)
- ICREA Funding Source: Custom
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We report on the detection with the MAGIC telescopes of very high energy (VHE) gamma-rays from IC 310, a head-tail radio galaxy in the Perseus galaxy cluster, observed during the interval 2008 November to 2010 February. The Fermi satellite has also detected this galaxy. The source is detected by MAGIC at a high statistical significance of 7.6 sigma in 20.6 hr of stereo data. The observed spectral energy distribution is flat with a differential spectral index of -2.00 +/- 0.14. The mean flux above 300 GeV, between 2009 October and 2010 February, (3.1 +/- 0.5) x 10(-12) cm(-2) s(-1), corresponds to (2.5 +/- 0.4)% of Crab Nebula units. Only an upper limit, of 1.9% of Crab Nebula units above 300 GeV, was obtained with the 2008 data. This, together with strong hints (>3 sigma) of flares in the middle of 2009 October and November, implies that the emission is variable. The MAGIC results favor a scenario with the VHE emission originating from the inner jet close to the central engine. More complicated models than a simple one-zone synchrotron self-Compton (SSC) scenario, e. g., multi-zone SSC, external Compton, or hadronic, may be required to explain the very flat spectrum and its extension over more than three orders of magnitude in energy.
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