Peer-Reviewed Journal Details
Mandatory Fields
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, A;Vassiliev, VV;Wakely, SP;Weekes, TC;Weinstein, A;Williams, DA;Zitzer, B;Ciprini, S;Fumagalli, M;Kaplan, K;Paneque, D;Prochaska, JX
2011
December
Astrophysical Journal
MULTIWAVELENGTH OBSERVATIONS OF THE PREVIOUSLY UNIDENTIFIED BLAZAR RX J0648.7+1516
Published
WOS: 23 ()
Optional Fields
LARGE-AREA TELESCOPE BL-LACERTAE OBJECTS ALL-SKY SURVEY PARTICLE-ACCELERATION SOURCE CATALOG RAY VERITAS MISSION
742
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.
0004-637X
10.1088/0004-637X/742/2/127
Grant Details
Publication Themes