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Aliu, E,Archambault, S,Arlen, T,Aune, T,Beilicke, M,Benbow, W,Bird, R,Bouvier, A,Buckley, JH,Bugaev, V,Cesarini, A,Ciupik, L,Connolly, MP,Cui, W,Dumm, J,Errando, M,Falcone, A,Federici, S,Feng, Q,Finley, JP,Fortin, P,Fortson, L,Furniss, A,Galante, N,Gerard, L,Gillanders, GH,Griffin, S,Grube, J,Gyuk, G,Hanna, D,Holder, J,Hughes, G,Humensky, TB,Kaaret, P,Kertzman, M,Khassen, Y,Kieda, D,Krawczynski, H,Krennrich, F,Lang, MJ,Madhavan, AS,Maier, G,Majumdar, P,McArthur, S,McCann, A,Moriarty, P,Mukherjee, R,Nieto, D,De Bhroithe, AO,Ong, RA,Orr, M,Otte, AN,Park, N,Perkins, JS,Pohl, M,Popkow, A,Prokoph, H,Quinn, J,Ragan, K,Reyes, LC,Reynolds, PT,Richards, GT,Roache, E,Saxon, DB,Sembroski, GH,Skole, C,Smith, AW,Soares-Furtado, M,Staszak, D,Telezhinsky, I,Tesic, G,Theiling, M,Varlotta, A,Vassiliev, VV
2013
December
Astrophysical Journal
LONG TERM OBSERVATIONS OF B2 1215+30 WITH VERITAS
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()
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BL Lacertae objects: general BL Lacertae objects: individual (B2 1215+30, VER J1217+301) BL LACERTAE OBJECTS LARGE-AREA TELESCOPE SIMULTANEOUS MULTIWAVELENGTH OBSERVATIONS SWIFT ULTRAVIOLET/OPTICAL TELESCOPE SPECTRAL ENERGY-DISTRIBUTIONS ACTIVE GALACTIC NUCLEI GAMMA-RAY ASTRONOMY BACKGROUND-RADIATION LAC OBJECTS W-COMAE
779
We report on VERITAS observations of the BL Lac object B2 1215+30 between 2008 and 2012. During this period, the source was detected at very high energies (VHEs; E > 100 GeV) by VERITAS with a significance of 8.9s and showed clear variability on timescales larger than months. In 2011, the source was found to be in a relatively bright state and a power-law fit to the differential photon spectrum yields a spectral index of 3.6 +/- 0.4(stat) +/- 0.3(syst) with an integral flux above 200 GeV of (8.0 +/- 0.9(stat) +/- 3.2(syst)) x 10(-12) cm(-2) s(-1). No short term variability could be detected during the bright state in 2011. Multi-wavelength data were obtained contemporaneously with the VERITAS observations in 2011 and cover optical (Super-LOTIS, MDM, Swift/UVOT), X-ray (Swift/XRT), and gamma-ray (Fermi-LAT) frequencies. These were used to construct the spectral energy distribution (SED) of B2 1215+30. A one-zone leptonic model is used to model the blazar emission and the results are compared to those of MAGIC from early 2011 and other VERITAS-detected blazars. The SED can be reproduced well with model parameters typical for VHE-detected BL Lac objects.
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