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Aliu, E,Aune, T,Beilicke, M,Benbow, W,Bottcher, M,Bouvier, A,Bradbury, SM,Buckley, JH,Bugaev, V,Cannon, A,Cesarini, A,Ciupik, L,Connolly, MP,Cui, W,Decerprit, G,Dickherber, R,Duke, C,Errando, M,Falcone, A,Feng, Q,Finnegan, G,Fortson, L,Furniss, A,Galante, N,Gall, D,Gillanders, GH,Godambe, S,Griffin, S,Grube, J,Gyuk, G,Hanna, D,Hivick, B,Holder, J,Huan, H,Hughes, G,Hui, CM,Humensky, TB,Kaaret, P,Karlsson, N,Kertzman, M,Kieda, D,Krawczynski, H,Krennrich, F,Maier, G,Majumdar, P,McArthur, S,McCann, A,Moriarty, P,Mukherjee, R,Nelson, T,Ong, RA,Orr, M,Otte, AN,Park, N,Perkins, JS,Pichel, A,Pohl, M,Prokoph, H,Quinn, J,Ragan, K,Reyes, LC,Reynolds, PT,Roache, E,Rose, HJ,Ruppel, J,Saxon, DB,Sembroski, GH,Skole, C,Smith, AW,Staszak, D,Tesic, G,Theiling, M,Thibadeau, S,Tsurusaki, K,Tyler, J,Varlotta,
2011
December
Astrophysical Journal
MULTIWAVELENGTH OBSERVATIONS OF THE PREVIOUSLY UNIDENTIFIED BLAZAR RX J0648.7+1516
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BL Lacertae objects: individual (RX J0648.7+1516, 1FGL J0648.8+1516, VER J0648+152) gamma rays: galaxies LARGE-AREA TELESCOPE BL-LACERTAE OBJECTS ALL-SKY SURVEY PARTICLE-ACCELERATION SOURCE CATALOG RAY VERITAS MISSION
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We report on the VERITAS discovery of very high energy (VHE) gamma-ray emission above 200 GeV from the high-frequency-peaked BL Lac (HBL) object RX J0648.7+1516 (GB J0648+1516), associated with 1FGL J0648.8+1516. The photon spectrum above 200 GeV is fitted by a power law dN/dE = F-0(E/E-0)(-Gamma) with a photon index Gamma of 4.4 +/- 0.8(stat) +/- 0.3(syst) and a flux normalization F-0 of (2.3 +/- 0.5(stat) +/- 1.2(sys)) x 10(-11) TeV-1 cm(-2) s(-1) with E-0 = 300 GeV. No VHE variability is detected during VERITAS observations of RX J0648.7+1516 between 2010 March 4 and April 15. Following the VHE discovery, the optical identification and spectroscopic redshift were obtained using the Shane 3 m Telescope at the Lick Observatory, showing the unidentified object to be a BL Lac type with a redshift of z = 0.179. Broadband multiwavelength observations contemporaneous with the VERITAS exposure period can be used to subclassify the blazar as an HBL object, including data from the MDM observatory, Swift-UVOT, and X-Ray Telescope, and continuous monitoring at photon energies above 1 GeV from the Fermi Large Area Telescope (LAT). We find that in the absence of undetected, high-energy rapid variability, the one-zone synchrotron self-Compton (SSC) model overproduces the high-energy gamma-ray emission measured by the Fermi-LAT over 2.3 years. The spectral energy distribution can be parameterized satisfactorily with an external-Compton or lepto-hadronic model, which have two and six additional free parameters, respectively, compared to the one-zone SSC model.
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