Long term observations of b2 1215+30 with veritas

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; And B. Zitzer; M. Böttcher; M. Fumagalli; And J. Jadhav

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

Long term observations of b2 1215+30 with veritas

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. FinleyP. 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, And B. Zitzer, M. Böttcher, M. Fumagalli, And 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 (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_stat ± 0.3syst with an integral flux above 200 GeV of (8.0 ± 0.9stat ± 3.2_syst) × 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.

Original language	English (US)
Article number	92
Journal	Astrophysical Journal
Volume	779
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/779/2/92
State	Published - Dec 20 2013

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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

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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., ... Jadhav, A. J. (2013). Long term observations of b2 1215+30 with veritas. Astrophysical Journal, 779(2), Article 92. https://doi.org/10.1088/0004-637X/779/2/92

@article{3286454fa81c47f7936e5a6ca2fb1241,

title = "Long term observations of b2 1215+30 with veritas",

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.",

author = "E. Aliu and S. Archambault and T. Arlen and T. Aune and M. Beilicke and W. Benbow and R. Bird and A. Bouvier and Buckley, {J. H.} and V. Bugaev and A. Cesarini and L. Ciupik and Connolly, {M. P.} and W. Cui and J. Dumm and M. Errando and A. Falcone and S. Federici and Q. Feng and Finley, {J. P.} and P. Fortin and L. Fortson and A. Furniss and N. Galante and L. G{\'e}rard and Gillanders, {G. H.} and S. Griffin and J. Grube and G. Gyuk and D. Hanna and J. Holder and G. Hughes and Humensky, {T. B.} and P. Kaaret and M. Kertzman and Y. Khassen and D. Kieda and H. Krawczynski and F. Krennrich and Lang, {M. J.} and Madhavan, {A. S.} and G. Maier and P. Majumdar and S. McArthur and A. McCann and P. Moriarty and R. Mukherjee and D. Nieto and {De Bhr{\'o}ithe}, {A. O.Faol{\'a}in} and Ong, {R. A.} and M. Orr and Otte, {A. N.} and N. Park and Perkins, {J. S.} and M. Pohl and A. Popkow and H. Prokoph and J. Quinn and K. Ragan and Reyes, {L. C.} and Reynolds, {P. T.} and Richards, {G. T.} and E. Roache and Saxon, {D. B.} and Sembroski, {G. H.} and C. Skole and Smith, {A. W.} and M. Soares-Furtado and D. Staszak and I. Telezhinsky and G. Te{\v s}i{\'c} and M. Theiling and A. Varlotta and Vassiliev, {V. V.} and S. Vincent and Wakely, {S. P.} and Weekes, {T. C.} and A. Weinstein and R. Welsing and Williams, {D. A.} and Zitzer, {And B.} and M. B{\"o}ttcher and M. Fumagalli and Jadhav, {And J.}",

note = "Funding Information: This research is supported by grants from the U.S. Department of Energy, the U.S. National Science Foundation and the Smithsonian Institution, by the Natural Sciences and Engineering Research Council (NSERC) in Canada, by Science Foundation Ireland (SFI 10/RFP/AST2748), and by the Science and Technology Facilities Council in the UK. The research presented in this Letter has used data from the Canadian Galactic Plane Survey, a Canadian project with international partners, supported by NSERC. D.B.S. acknowledges the NASA Delaware Space Grant Program for its support of this research. J.P.H. acknowledges support from NASA grant NNX08AZ86G to Rutgers University. Facility: VERITAS",

year = "2013",

month = dec,

day = "20",

doi = "10.1088/0004-637X/779/2/92",

language = "English (US)",

volume = "779",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "2",

}

Aliu, E, Archambault, S, Arlen, T, Aune, T, Beilicke, M, Benbow, W, Bird, R, Bouvier, A, Buckley, JH, Bugaev, V, Cesarini, A, Ciupik, L, Connolly, MP, Cui, W, Dumm, J, Errando, M, Falcone, A, Federici, S, Feng, Q, Finley, JP, Fortin, P, Fortson, L, Furniss, A, Galante, N, Gérard, L, Gillanders, GH, Griffin, S, Grube, J, Gyuk, G, Hanna, D, Holder, J, Hughes, G, Humensky, TB, Kaaret, P, Kertzman, M, Khassen, Y, Kieda, D, Krawczynski, H, Krennrich, F, Lang, MJ, Madhavan, AS, Maier, G, Majumdar, P, McArthur, S, McCann, A, Moriarty, P, Mukherjee, R, Nieto, D, De Bhróithe, AOF, Ong, RA, Orr, M, Otte, AN, Park, N, Perkins, JS, Pohl, M, Popkow, A, Prokoph, H, Quinn, J, Ragan, K, Reyes, LC, Reynolds, PT, Richards, GT, Roache, E, Saxon, DB, Sembroski, GH, Skole, C, Smith, AW, Soares-Furtado, M, Staszak, D, Telezhinsky, I, Tešić, G, Theiling, M, Varlotta, A, Vassiliev, VV, Vincent, S, Wakely, SP, Weekes, TC, Weinstein, A, Welsing, R, Williams, DA, Zitzer, AB, Böttcher, M, Fumagalli, M & Jadhav, AJ 2013, 'Long term observations of b2 1215+30 with veritas', Astrophysical Journal, vol. 779, no. 2, 92. https://doi.org/10.1088/0004-637X/779/2/92

TY - JOUR

T1 - Long term observations of b2 1215+30 with veritas

AU - Aliu, E.

AU - Archambault, S.

AU - Arlen, T.

AU - Aune, T.

AU - Beilicke, M.

AU - Benbow, W.

AU - Bird, R.

AU - Bouvier, A.

AU - Buckley, J. H.

AU - Bugaev, V.

AU - Cesarini, A.

AU - Ciupik, L.

AU - Connolly, M. P.

AU - Cui, W.

AU - Dumm, J.

AU - Errando, M.

AU - Falcone, A.

AU - Federici, S.

AU - Feng, Q.

AU - Finley, J. P.

AU - Fortin, P.

AU - Fortson, L.

AU - Furniss, A.

AU - Galante, N.

AU - Gérard, L.

AU - Gillanders, G. H.

AU - Griffin, S.

AU - Grube, J.

AU - Gyuk, G.

AU - Hanna, D.

AU - Holder, J.

AU - Hughes, G.

AU - Humensky, T. B.

AU - Kaaret, P.

AU - Kertzman, M.

AU - Khassen, Y.

AU - Kieda, D.

AU - Krawczynski, H.

AU - Krennrich, F.

AU - Lang, M. J.

AU - Madhavan, A. S.

AU - Maier, G.

AU - Majumdar, P.

AU - McArthur, S.

AU - McCann, A.

AU - Moriarty, P.

AU - Mukherjee, R.

AU - Nieto, D.

AU - De Bhróithe, A. O.Faoláin

AU - Ong, R. A.

AU - Orr, M.

AU - Otte, A. N.

AU - Park, N.

AU - Perkins, J. S.

AU - Pohl, M.

AU - Popkow, A.

AU - Prokoph, H.

AU - Quinn, J.

AU - Ragan, K.

AU - Reyes, L. C.

AU - Reynolds, P. T.

AU - Richards, G. T.

AU - Roache, E.

AU - Saxon, D. B.

AU - Sembroski, G. H.

AU - Skole, C.

AU - Smith, A. W.

AU - Soares-Furtado, M.

AU - Staszak, D.

AU - Telezhinsky, I.

AU - Tešić, G.

AU - Theiling, M.

AU - Varlotta, A.

AU - Vassiliev, V. V.

AU - Vincent, S.

AU - Wakely, S. P.

AU - Weekes, T. C.

AU - Weinstein, A.

AU - Welsing, R.

AU - Williams, D. A.

AU - Zitzer, And B.

AU - Böttcher, M.

AU - Fumagalli, M.

AU - Jadhav, And J.

N1 - Funding Information: This research is supported by grants from the U.S. Department of Energy, the U.S. National Science Foundation and the Smithsonian Institution, by the Natural Sciences and Engineering Research Council (NSERC) in Canada, by Science Foundation Ireland (SFI 10/RFP/AST2748), and by the Science and Technology Facilities Council in the UK. The research presented in this Letter has used data from the Canadian Galactic Plane Survey, a Canadian project with international partners, supported by NSERC. D.B.S. acknowledges the NASA Delaware Space Grant Program for its support of this research. J.P.H. acknowledges support from NASA grant NNX08AZ86G to Rutgers University. Facility: VERITAS

PY - 2013/12/20

Y1 - 2013/12/20

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84890040124&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84890040124&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/779/2/92

DO - 10.1088/0004-637X/779/2/92

M3 - Article

AN - SCOPUS:84890040124

SN - 0004-637X

VL - 779

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 92

ER -

Long term observations of b2 1215+30 with veritas

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