Title

Long Term Observations of B2 1215+30 with Veritas

Authors

E. Aliu, Barnard College, Columbia University, NY 10027, USA
S. Archambault, McGill University, Montreal, QC H3A 2T8, Canada
T. Arlen, University of California, Los Angeles, CA 90095, USA
T. Aune, University of California, Los Angeles, CA 90095, USA
M. Beilicke, Washington University, St. Louis, MO 63130, USA
W. Benbow, Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645, USA
R. Bird, University College Dublin, Belfield, Dublin 4, Ireland
A. Bouvier, University of California, Santa Cruz, CA 95064, USA
J. H. Buckley, Washington University, St. Louis, MO 63130, USA
V. Bugaev, Washington University, St. Louis, MO 63130, USA
A. Cesarini, National University of Ireland Galway, University Road, Galway, Ireland
L. Ciupik, Adler Planetarium and Astronomy Museum, Chicago, IL 60605, USA
M. P. Connolly, National University of Ireland Galway, University Road, Galway, Ireland
W. Cui, Purdue University, West Lafayette, IN 47907, USA
J. Dumm, University of Minnesota, Minneapolis, MN 55455, USA
M. Errando, Barnard College, Columbia University, NY 10027, USA
A. Falcone, Pennsylvania State University, University Park, PA 16802, USA
S. Federici, DESY, Platanenallee 6, D-15738 Zeuthen, Germany
Q. Feng, Purdue University, West Lafayette, IN 47907, USA
J. P. Finley, Purdue University, West Lafayette, IN 47907, USA
P. Fortin, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645, USA
L. Fortson, University of Minnesota, Minneapolis, MN 55455, USA
A. Furniss, University of California, Santa Cruz, CA 95064, USA
N. Galante, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645, USA
L. Gerard, DESY, Platanenallee 6, D-15738 Zeuthen, Germany
G. H. Gillanders, National University of Ireland Galway, University Road, Galway, Ireland
S. Griffin, McGill University, Montreal, QC H3A 2T8, Canada
J. Grube, Adler Planetarium and Astronomy Museum, Chicago, IL 60605, USA
G. Gyuk, Adler Planetarium and Astronomy Museum, Chicago, IL 60605, USA
D. Hanna, McGill University, Montreal, QC H3A 2T8, Canada
J. Holder, University of Delaware, Newark, DE 19716, USA
G. Hughes, DESY, Platanenallee 6, D-15738 Zeuthen, Germany
T. B. Humensky, Columbia University, New York, NY 10027, USA
P. Kaaret, University of Iowa, Van Allen Hall, Iowa City, IA 52242, USA
M. Kertzman, DePauw University, Greencastle, IN 46135-0037, USA
Y. Khassen, University College Dublin, Belfield, Dublin 4, Ireland
D. Kieda, University of Utah, Salt Lake City, UT 84112, USA
H. Krawczynski, Washington University, St. Louis, MO 63130, USA
F. Krennrich, Iowa State University, Ames, IA 50011, USA
M. J. Lang, National University of Ireland Galway, University Road, Galway, Ireland
A. S. Madhavan, Iowa State University, Ames, IA 50011, USA
G. Maier, DESY, Platanenallee 6, D-15738 Zeuthen, Germany
P. Majumdar, Saha Institute of Nuclear Physics, Kolkata 700 064, India
S. McArthur, University of Chicago, Chicago, IL 60637, USA
A. McCann, Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA
P. Moriarty, Department of Life and Physical Sciences, Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland
R. Mukherjee, Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027, USA
D. Nieto, Physics Department, Columbia University, New York, NY 10027, USA
A. O’Faolain de Bhroithe, School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
P. T. Reynolds, Department of Applied Physics and Instrumentation, Cork Institute of Technology, Bishopstown, Cork, Ireland
Et Al

Document Type

Article

Disciplines

Astrophysics and Astronomy

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)

Recommended Citation

Aliu, E.; Archambault, S.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bird, R.; Bouvier, A.; Buckley, J. H.; Bugaev, V.; Cesarini, A.; Ciupik, L.; Connolly, M. P.; Cui, W.; Dumm, J.; Errando, M.; Falcone, A.; Federici, S.; Feng, Q.; Finley, J. P.; Fortin, P.; Fortson, L.; Furniss, A.; Galante, N.; Gerard, L.; Gillanders, G. H.; Griffin, S.; Grube, J.; Gyuk, G.; Hanna, D.; Holder, J.; Hughes, G.; Humensky, T. B.; Kaaret, P.; Kertzman, M.; Khassen, Y.; Kieda, D.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; Madhavan, A. S.; Maier, G.; Majumdar, P.; McArthur, S.; McCann, A.; Moriarty, P.; Mukherjee, R.; Nieto, D.; O’Faolain de Bhroithe, A.; Reynolds, P. T.; and Al, Et, "Long Term Observations of B2 1215+30 with Veritas" (2013). Physical Sciences Publications [online].
Available at: https://doi.org/10.1088/0004-637X/779/2/92