Long term observations of B2 1215+30 with VERITAS

VERITAS collaboration; E. Aliu; S. Archambault; T. Arlen; T. Aune; M. Beilicke; W. Benbow; R. Bird; A. Bouvier; J. H. Buckley; V. Bugaev; A. Cesarini; L. Ciupik; M. P. Connolly; W. Cui; J. Dumm; M. Errando; A. Falcone; S. Federici; Q. Feng; J. P. Finley; P. Fortin; L. Fortson; A. Furniss; N. Galante; L. Gérard; G. H. Gillanders; S. Griffin; J. Grube; G. Gyuk; D. Hanna; J. Holder; G. Hughes; T. B. Humensky; P. Kaaret; M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; M. J. Lang; A. S Madhavan; G. Maier; P. Majumdar; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; D. Nieto; A. O'Faoláin de Bhróithe

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

Long term observations of B2 1215+30 with VERITAS

High Energy Astrophysical Phenomena 2015-06-17 v1

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

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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 (VHE; E > 100 GeV) by VERITAS with a significance of $8.9\sigma$ and showed clear variability on time scales 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 $3.6 \pm 0.4_{\mathrm{stat}} \pm 0.3_{\mathrm{syst}}$ with an integral flux above 200 GeV of $(8.0 \pm 0.9_{\mathrm{stat}} \pm 3.2_{\mathrm{syst}}) \times 10^{-12}\, \mathrm{cm}^{-2} \mathrm{s}^{-1}$ . No short term variability could be detected during the bright state in 2011. Multi-wavelength data were obtained contemporaneous 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 well reproduced with model parameters typical for VHE-detected BL Lacs.

Keywords

BL Lac object very high energy gamma rays VERITAS spectral energy distribution leptonic model multi-wavelength observations variability

Cite

@article{arxiv.1310.6498,
  title  = {Long term observations of B2 1215+30 with VERITAS},
  author = {VERITAS collaboration and E. Aliu and S. Archambault and T. Arlen and T. Aune and M. Beilicke and W. Benbow and R. Bird and A. Bouvier and J. H. Buckley and V. Bugaev and A. Cesarini and L. Ciupik and M. P. Connolly and W. Cui and J. Dumm and M. Errando and A. Falcone and S. Federici and Q. Feng and J. P. Finley and P. Fortin and L. Fortson and A. Furniss and N. Galante and L. Gérard and G. H. Gillanders and S. Griffin and J. Grube and G. Gyuk and D. Hanna and J. Holder and G. Hughes and T. B. Humensky and P. Kaaret and M. Kertzman and Y. Khassen and D. Kieda and H. Krawczynski and F. Krennrich and M. J. Lang and A. S Madhavan and G. Maier and P. Majumdar and S. McArthur and A. McCann and P. Moriarty and R. Mukherjee and D. Nieto and A. O'Faoláin de Bhróithe and R. A. Ong and M. Orr and A. N. Otte and N. Park and J. S. Perkins and M. Pohl and A. Popkow and H. Prokoph and J. Quinn and K. Ragan and L. C. Reyes and P. T. Reynolds and G. T. Richards and E. Roache and D. B. Saxon and G. H. Sembroski and C. Skole and A. W. Smith and M. Soares-Furtado and D. Staszak and I. Telezhinsky and G. Tešić and M. Theiling and A. Varlotta and V. V. Vassiliev and S. Vincent and S. P. Wakely and T. C. Weekes and A. Weinstein and R. Welsing and D. A. Williams and B. Zitzer and M. Böttcher and M. Fumagalli and J. Jadhav},
  journal= {arXiv preprint arXiv:1310.6498},
  year   = {2015}
}

Comments

34 pages, 5 figures, accepted for publication in ApJ

Long term observations of B2 1215+30 with VERITAS

Abstract

Keywords

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