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Long term observations of B2 1215+30 with VERITAS.

Aliu, E. and Archambault, S. and Arlen, T. and Aune, T. and Beilicke, M. and Benbow, W. and Bird, R. and Bouvier, A. and Buckley, J.H. and Bugaev, V. and Cesarini, A. and Ciupik, L. and Connolly, M.P. and Cui, W. and Dumm, J. and Errando, M. and Falcone, A. and Federici, S. and Feng, Q. and Finley, J.P. and Fortin, P. and Fortson, L. and Furniss, A. and Galante, N. and Gérard, L. and Gillanders, G.H. and Griffin, S. and Grube, J. and Gyuk, G. and Hanna, D. and Holder, J. and Hughes, G. and Humensky, T.B. and Kaaret, P. and Kertzman, M. and Khassen, Y. and Kieda, D. and Krawczynski, H. and Krennrich, F. and Lang, M.J. and Madhavan, A.S. and Maier, G. and Majumdar, P. and McArthur, S. and McCann, A. and Moriarty, P. and Mukherjee, R. and Nieto, D. and O'Faoláin de Bhróithe, A. and Ong, R.A. and Orr, M. and Otte, A.N. and Park, N. and Perkins, J.S. and Pohl, M. and Popkow, A. and Prokoph, H. and Quinn, J. and Ragan, K. and Reyes, L.C. and Reynolds, P.T. and Richards, G.T. and Roache, E. and Saxon, D.B. and Sembroski, G.H. and Skole, C. and Smith, A.W. and Soares-Furtado, M. and Staszak, D. and Telezhinsky, I. and Tešić, G. and Theiling, M. and Varlotta, A. and Vassiliev, V.V. and Vincent, S. and Wakely, S.P. and Weekes, T.C. and Weinstein, A. and Welsing, R. and Williams, D.A. and Zitzer, B. and Böttcher, M. and Fumagalli, M. and Jadhav, J. (2013) 'Long term observations of B2 1215+30 with VERITAS.', Astrophysical journal., 779 (2). p. 92.


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 8.9σ 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 ± 0.4stat ± 0.3syst with an integral flux above 200 GeV of (8.0 ± 0.9stat ± 3.2syst) × 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.

Item Type:Article
Keywords:BL Lacertae objects: general, BL Lacertae objects: individual (B2 1215+30, VER J1217+301).
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Publisher statement:© 2013. The American Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:03 July 2014
Date of first online publication:December 2013
Date first made open access:No date available

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