Long term observations of B2 1215+30 with veritas

E Aliu; M Errando; S Archambault; T Arlen; T Aune; M Beilicke; J. H Buckley; V Bugaev; W Benbow; R Bird; A Bouvier; A Cesarini; M. P Connolly; L Ciupik; W Cui; Q Feng; J. P Finley; J Dumm; A Falcone; S Federici; VERITAS Collaboration

doi:10.1088/0004-637X/779/2/92

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Long term observations of B2 1215+30 with veritas

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Long term observations of B2 1215+30 with veritas

E Aliu, M Errando, S Archambault, T Arlen, T Aune, M Beilicke, J. H Buckley, V Bugaev, W Benbow, R Bird, …

The Astrophysical journal, Vol.779(2), 92

12/20/2013

DOI: 10.1088/0004-637X/779/2/92

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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 ± 0.4{sub stat} ± 0.3{sub syst} with an integral flux above 200 GeV of (8.0 ± 0.9{sub stat} ± 3.2{sub syst}) × 10{sup –12} cm{sup –2} s{sup –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.

ASTROPHYSICS, COSMOLOGY AND ASTRONOMY

BL LACERTAE OBJECTS

COMPARATIVE EVALUATIONS

EMISSION

ENERGY SPECTRA

GAMMA RADIATION

GEV RANGE

PHOTONS

WAVELENGTHS

X RADIATION

Details

Title: Subtitle: Long term observations of B2 1215+30 with veritas
Creators: E Aliu - Columbia University
M Errando - Columbia University
S Archambault - McGill University
T Arlen - University of California, Los Angeles
T Aune - University of California, Los Angeles
M Beilicke - Washington University in St. Louis
J. H Buckley - Washington University in St. Louis
V Bugaev - Washington University in St. Louis
W Benbow - Harvard University
R Bird - University College Dublin
A Bouvier - University of California, Santa Cruz
A Cesarini - Ollscoil na Gaillimhe – University of Galway
M. P Connolly - Ollscoil na Gaillimhe – University of Galway
L Ciupik - Adler Planetarium
W Cui - Purdue University West Lafayette
Q Feng - Purdue University West Lafayette
J. P Finley - Purdue University West Lafayette
J Dumm - University of Minnesota
A Falcone - Pennsylvania State University
S Federici - University of Potsdam
VERITAS Collaboration
Contributors: P Kaaret (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.779(2), 92
DOI: 10.1088/0004-637X/779/2/92
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Institute of Physics (IOP)
Language: English
Date published: 12/20/2013
Academic Unit: Physics and Astronomy
Record Identifier: 9984199801802771

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