Veritas upper limit on the very high energy emission from the radio galaxy NGC 1275

V. A. Acciari , E. Aliu , T. Arlen , T. Aune , M. Bautista , M. Beilicke , W. Benbow , D. Boltuch , S. M. Bradbury , J. H. Buckley , V. Bugaev , K. Byrum , A. Cannon , O. Celik , A. Cesarini , L. Ciupik , P. Cogan , W. Cui , R. Dickherber , C. Duke , S. J. Fegan , J. P. Finley , P. Fortin , L. Fortson , A. Furniss , N. Galante , D. Gall , K. Gibbs , G. H. Gillanders , S. Godambe , J. Grube , R. Guenette , G. Gyuk , D. Hanna , J. Holder , D. Horan (1) , C. M. Hui , T. B. Humensky , A. Imran , P. Kaaret , N. Karlsson , M. Kertzman , D. Kieda , A. Konopelko , H. Krawczynski , F. Krennrich , M. J. Lang , S. Lebohec , G. Maier , A. Mccann , M. Mccutcheon , J. Millis , P. Moriarty , R. Mukherjee , R. A. Ong , A. N. Otte , D. Pandel , J. S. Perkins , M. Pohl , J. Quinn , K. Ragan , P. T. Reynolds , E. Roache , H. J. Rose , M. Schroedter , G. H. Sembroski , A. W. Smith , D. D. Steele , S. P. Swordy , M. Theiling , J. A. Toner , A. Varlotta , V. V. Vassiliev , Serge Vincent , R. G. Wagner , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , T. Weisgarber , D. A. Williams , S. Wissel , M. Wood , B. Zitzer , J. Kataoka , E. Cavazzuti , C. C. Cheung , B. Lott (2) , D. J. Thompson , G. Tosti

1 LLR - Laboratoire Leprince-Ringuet
2 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

The recent detection by the Fermi γ-ray space telescope of high-energy γ-rays from the radio galaxy NGC 1275 makes the observation of the very high energy (VHE: E>100 GeV) part of its broadband spectrum particularly interesting, especially for the understanding of active galactic nuclei with misaligned multi-structured jets. The radio galaxy NGC 1275 was recently observed by VERITAS at energies above 100 GeV for about 8 hr. No VHE γ-ray emission was detected by VERITAS from NGC 1275. A 99% confidence level upper limit of 2.1% of the Crab Nebula flux level is obtained at the decorrelation energy of approximately 340 GeV, corresponding to 19% of the power-law extrapolation of the Fermi Large Area Telescope result.

Mots clés: Perseus A); galaxies: Seyfert; gamma rays: observations; galaxies: individual (NGC 1275; 3C 84

Domaines: Phénomènes cosmiques de haute energie [astro-ph.HE]; Phénomènes cosmiques de haute energie [astro-ph.HE]

V. A. Acciari, E. Aliu, T. Arlen, T. Aune, M. Bautista, et al.. Veritas upper limit on the very high energy emission from the radio galaxy NGC 1275. The Astrophysical journal letters, 2009, 706, pp.L275-L280. ⟨10.1088/0004-637X/706/2/L275⟩. ⟨in2p3-00460536⟩