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Detection of very high energy gamma-ray emission from NGC 1275 by the MAGIC telescopes

AuthorsAleksic, J.; Cea del Pozo, Elsa de ; Hadasch, Daniela ; Torres, Diego F. ; Pérez-Torres, Miguel A. ; Prada, Francisco ; Zandanel, Fabio
KeywordsGamma rays: galaxies
Galaxies: active
Galaxies: individual (IC 310)
Issue Date2010
PublisherEDP Sciences
AbstractWe report on the detection with the MAGIC telescopes of very high energy -rays from IC 310, a head-tail radio galaxy in the Perseus galaxy cluster, observed during the interval November 2008 to February 2010. The Fermi satellite has also detected this galaxy. The source is detected by MAGIC at a high statistical significance of 7.6 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 October 2009 and February 2010, (3.1±0.5)×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 ) of flares in the middle of October and November 2009, implies that the emission is variable. The MAGIC results favour a scenario with the very high energy emission originating from the inner jet close to the central engine. More complicated models than a simple one-zone 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.
Description6 páginas, 5 figuras.-- Accepted on ApJ Letters as part of the special Sunrise issue.-- MAGIC Collaboration: et al.
Publisher version (URL)http://arxiv.org/abs/1009.2155
Appears in Collections:(ICE) Artículos
(IAA) Artículos
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