Journal Article


Et Al
P.T. Reynolds
A. O’Faolain de Bhroithe
D. Nieto
R. Mukherjee
P Moriarty
A McCann
S. McArthur
P. Majumdar
G. Maier
and 41 others



astrophysics and astronomy spectral energy distribution law observations b2 1215 30 ver j1217 301 x ray cm 1 bl lacertae

Long Term Observations of B2 1215+30 with Veritas (2013)

Abstract 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. Key words: BL Lacertae objects: general – BL Lacertae objects: individual (B2 1215+30, VER J1217+301)
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Ireland -> Cork Institute of Technology -> Physical Sciences

Full list of authors on original publication

Et Al, P.T. Reynolds, A. O’Faolain de Bhroithe, D. Nieto, R. Mukherjee, P Moriarty, A McCann, S. McArthur, P. Majumdar, G. Maier and 41 others

Experts in our system

P.T. Reynolds
Cork Institute of Technology
Total Publications: 94
Amanda McCann
University College Dublin
Total Publications: 41