Discovery of High-energy and Very High Energy Gamma-ray Emission from the Blazar RBS 0413
Creators: name: VERITAS Collaboration
name: Aliu, E.
name: Archambault, S.
name: Arlen, T.
name: Aune, T.
name: Beilicke, M.
name: Benbow, W.
name: Boettcher, M.
name: Bouvier, A.
name: Bradbury, S. M.
name: Buckley, J. H.
name: Bugaev, V.
name: Byrum, K.
name: Cannon, A.
name: Cesarini, A.
name: Ciupik, L.
name: Collins-Hughes, E.
name: Connolly, M. P.
name: Coppi, P.
name: Cui, W.
name: Decerprit, G.
name: Dickherber, R.
name: Dumm, J.
name: Errando, M.
name: Falcone, A.
name: Feng, Q.
name: Finley, J. P.
name: Finnegan, G.
name: Fortson, L.
name: Furniss, A.
name: Galante, N.
name: Gall, D.
name: Godambe, S.
name: Griffin, S.
name: Grube, J.
name: Gyuk, G.
name: Hanna, D.
name: Hawkins, K.
name: Holder, J.
name: Huan, H.
name: Hughes, G.
name: Humensky, T. B.
name: Kaaret, P.
name: Karlsson, N.
name: Kertzman, M.
name: Khassen, Y.
name: Kieda, D.
name: Krawczynski, H.
name: Krennrich, F.
name: Lang, M. J.
name: Lee, K.
name: Madhavan, A. S
name: Maier, G.
name: Majumdar, P.
name: McArthur, S.
name: McCann, A.
name: Moriarty, P.
name: Mukherjee, R.
name: Ong, R. A.
name: Orr, M.
name: Otte, A. N.
name: Palma, N.
name: Park, N.
name: Perkins, J. S.
name: Pichel, A.
name: Pohl, M.
name: Prokoph, H.
name: Quinn, J.
name: Ragan, K.
name: Reyes, L. C.
name: Reynolds, P. T.
name: Roache, E.
name: Rose, H. J.
name: Ruppel, J.
name: Saxon, D. B.
name: Schroedter, M.
name: Sembroski, G. H.
name: Senturk, G. D.
name: Smith, A. W.
name: Staszak, D.
name: Telezhinsky, I.
name: Tesic, G.
name: Theiling, M.
name: Thibadeau, S.
name: Tsurusaki, K.
name: Varlotta, A.
name: Vivier, M.
name: Wakely, S. P.
name: Ward, J. E.
name: Weekes, T. C.
name: Weinstein, A.
name: Weisgarber, T.
name: Williams, D. A.
name: Zitzer, B.
name: Fortin, P.
name: Horan, D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report on the discovery of high-energy (HE; E &gt; 0.1 GeV) and very high-energy (VHE; E &gt; 100 GeV) gamma-ray emission from the high-frequency-peaked BL Lac object RBS 0413. VERITAS, a ground-based gamma-ray observatory, detected VHE gamma rays from RBS 0413 with a statistical significance of 5.5 standard deviations (sigma) and a gamma-ray flux of (1.5 \pm 0.6stat \pm 0.7syst) \times 10^(-8) photons m^(-2) s^(-1) (\sim 1% of the Crab Nebula flux) above 250 GeV. The observed spectrum can be described by a power law with a photon index of 3.18 \pm 0.68stat \pm 0.30syst. Contemporaneous observations with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope detected HE gamma rays from RBS 0413 with a statistical significance of more than 9 sigma, a power-law photon index of 1.57 \pm 0.12stat +0.11sys -0.12sys and a gamma-ray flux between 300 MeV and 300 GeV of (1.64 \pm 0.43stat +0.31sys -0.22sys) \times 10^(-5) photons m^(-2) s^(-1). We present the results from Fermi-LAT and VERITAS, including a spectral energy distribution modeling of the gamma-ray, quasi-simultaneous X-ray (Swift-XRT), ultraviolet (Swift-UVOT) and R-band optical (MDM) data. We find that, if conditions close to equipartition are required, both the combined synchrotron self-Compton/external-Compton and the lepto-hadronic models are preferred over a pure synchrotron self-Compton model.
description: 14 pages, 3 figures, accepted to ApJ, corresponding author: G. D. Senturk