Veritas discovery of 1200 gev gamma-ray emission from the intermediate-frequency-peaked bl lacertae object w comae

V. A. Acciari; E. Aliu; M. Beilicke; W. Benbow; M. Böttcher; S. M. Bradbury; J. H. Buckley; V. Bugaev; Y. Butt; O. Celik; A. Cesarini; L. Ciupik; Y. C.K. Chow; P. Cogan; P. Colin; W. Cui; M. K. Daniel; T. Ergin; A. D. Falcone; S. J. Fegan; J. P. Finley; G. Finnegan; P. Fortin; L. F. Fortson; A. Furniss; D. Gall; G. H. Gillanders; J. Grube; R. Guenette; G. Gyuk; D. Hanna; E. Hays; J. Holder; D. Horan; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; D. B. Kieda; A. Konopelko; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; K. Lee; G. Maier; A. McCann; M. McCutcheon

doi:10.1086/592244

Veritas discovery of 1200 gev gamma-ray emission from the intermediate-frequency-peaked bl lacertae object w comae

V. A. Acciari, E. Aliu, M. Beilicke, W. Benbow, M. Böttcher, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, O. Celik, A. Cesarini, L. Ciupik, Y. C.K. Chow, P. Cogan, P. Colin, W. Cui, M. K. Daniel, T. Ergin, A. D. Falcone, S. J. FeganJ. P. Finley, G. Finnegan, P. Fortin, L. F. Fortson, A. Furniss, D. Gall, G. H. Gillanders, J. Grube, R. Guenette, G. Gyuk, D. Hanna, E. Hays, J. Holder, D. Horan, C. M. Hui, T. B. Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. B. Kieda, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, K. Lee, G. Maier, A. McCann, M. McCutcheon

Physics and Astronomy (Twin Cities)

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Abstract

We report the detection of very high energy 7-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae (z=p 0.102) by VERITAS. The source was observed between 2008 January and April. A strong outburst of 7-ray emission was measured in the middle of March, lasting for only 4 days. The energy spectrum measured during the two highest flare nights is fit by a power law and is found to be very steep, with a differential photon spectral index of ×=3.81 ± 0.35_stat ± 0.34_syst. The integral photon flux above 200 GeV during those two nights corresponds to roughly 9% of the flux from the Crab Nebula. Quasi-simultaneous Swift observations at X-ray energies were triggered by the VERITAS observations. The spectral energy distribution of the flare data can be described by synchrotron self-Compton (SSC) or external Compton (EC) leptonic jet models.

Original language	English (US)
Pages (from-to)	L73-L77
Journal	Astrophysical Journal
Volume	684
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/592244
State	Published - 2008

Keywords

BL Lacertae objects: Individual (W Comae)
Gamma rays: Observations

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Acciari, V. A., Aliu, E., Beilicke, M., Benbow, W., Böttcher, M., Bradbury, S. M., Buckley, J. H., Bugaev, V., Butt, Y., Celik, O., Cesarini, A., Ciupik, L., Chow, Y. C. K., Cogan, P., Colin, P., Cui, W., Daniel, M. K., Ergin, T., Falcone, A. D., ... McCutcheon, M. (2008). Veritas discovery of 1200 gev gamma-ray emission from the intermediate-frequency-peaked bl lacertae object w comae. Astrophysical Journal, 684(2 PART 2), L73-L77. https://doi.org/10.1086/592244

Acciari, VA, Aliu, E, Beilicke, M, Benbow, W, Böttcher, M, Bradbury, SM, Buckley, JH, Bugaev, V, Butt, Y, Celik, O, Cesarini, A, Ciupik, L, Chow, YCK, Cogan, P, Colin, P, Cui, W, Daniel, MK, Ergin, T, Falcone, AD, Fegan, SJ, Finley, JP, Finnegan, G, Fortin, P, Fortson, LF, Furniss, A, Gall, D, Gillanders, GH, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Hays, E, Holder, J, Horan, D, Hui, CM, Humensky, TB, Imran, A, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, DB, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, MJ, LeBohec, S, Lee, K, Maier, G, McCann, A & McCutcheon, M 2008, 'Veritas discovery of 1200 gev gamma-ray emission from the intermediate-frequency-peaked bl lacertae object w comae', Astrophysical Journal, vol. 684, no. 2 PART 2, pp. L73-L77. https://doi.org/10.1086/592244

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title = "Veritas discovery of 1200 gev gamma-ray emission from the intermediate-frequency-peaked bl lacertae object w comae",

abstract = "We report the detection of very high energy 7-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae (z=p 0.102) by VERITAS. The source was observed between 2008 January and April. A strong outburst of 7-ray emission was measured in the middle of March, lasting for only 4 days. The energy spectrum measured during the two highest flare nights is fit by a power law and is found to be very steep, with a differential photon spectral index of ×=3.81 ± 0.35stat ± 0.34syst. The integral photon flux above 200 GeV during those two nights corresponds to roughly 9% of the flux from the Crab Nebula. Quasi-simultaneous Swift observations at X-ray energies were triggered by the VERITAS observations. The spectral energy distribution of the flare data can be described by synchrotron self-Compton (SSC) or external Compton (EC) leptonic jet models.",

keywords = "BL Lacertae objects: Individual (W Comae), Gamma rays: Observations",

author = "Acciari, {V. A.} and E. Aliu and M. Beilicke and W. Benbow and M. B{\"o}ttcher and Bradbury, {S. M.} and Buckley, {J. H.} and V. Bugaev and Y. Butt and O. Celik and A. Cesarini and L. Ciupik and Chow, {Y. C.K.} and P. Cogan and P. Colin and W. Cui and Daniel, {M. K.} and T. Ergin and Falcone, {A. D.} and Fegan, {S. J.} and Finley, {J. P.} and G. Finnegan and P. Fortin and Fortson, {L. F.} and A. Furniss and D. Gall and Gillanders, {G. H.} and J. Grube and R. Guenette and G. Gyuk and D. Hanna and E. Hays and J. Holder and D. Horan and Hui, {C. M.} and Humensky, {T. B.} and A. Imran and P. Kaaret and N. Karlsson and M. Kertzman and Kieda, {D. B.} and A. Konopelko and H. Krawczynski and F. Krennrich and Lang, {M. J.} and S. LeBohec and K. Lee and G. Maier and A. McCann and M. McCutcheon",

year = "2008",

doi = "10.1086/592244",

language = "English (US)",

volume = "684",

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journal = "Astrophysical Journal",

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TY - JOUR

T1 - Veritas discovery of 1200 gev gamma-ray emission from the intermediate-frequency-peaked bl lacertae object w comae

AU - Acciari, V. A.

AU - Aliu, E.

AU - Beilicke, M.

AU - Benbow, W.

AU - Böttcher, M.

AU - Bradbury, S. M.

AU - Buckley, J. H.

AU - Bugaev, V.

AU - Butt, Y.

AU - Celik, O.

AU - Cesarini, A.

AU - Ciupik, L.

AU - Chow, Y. C.K.

AU - Cogan, P.

AU - Colin, P.

AU - Cui, W.

AU - Daniel, M. K.

AU - Ergin, T.

AU - Falcone, A. D.

AU - Fegan, S. J.

AU - Finley, J. P.

AU - Finnegan, G.

AU - Fortin, P.

AU - Fortson, L. F.

AU - Furniss, A.

AU - Gall, D.

AU - Gillanders, G. H.

AU - Grube, J.

AU - Guenette, R.

AU - Gyuk, G.

AU - Hanna, D.

AU - Hays, E.

AU - Holder, J.

AU - Horan, D.

AU - Hui, C. M.

AU - Humensky, T. B.

AU - Imran, A.

AU - Kaaret, P.

AU - Karlsson, N.

AU - Kertzman, M.

AU - Kieda, D. B.

AU - Konopelko, A.

AU - Krawczynski, H.

AU - Krennrich, F.

AU - Lang, M. J.

AU - LeBohec, S.

AU - Lee, K.

AU - Maier, G.

AU - McCann, A.

AU - McCutcheon, M.

PY - 2008

Y1 - 2008

N2 - We report the detection of very high energy 7-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae (z=p 0.102) by VERITAS. The source was observed between 2008 January and April. A strong outburst of 7-ray emission was measured in the middle of March, lasting for only 4 days. The energy spectrum measured during the two highest flare nights is fit by a power law and is found to be very steep, with a differential photon spectral index of ×=3.81 ± 0.35stat ± 0.34syst. The integral photon flux above 200 GeV during those two nights corresponds to roughly 9% of the flux from the Crab Nebula. Quasi-simultaneous Swift observations at X-ray energies were triggered by the VERITAS observations. The spectral energy distribution of the flare data can be described by synchrotron self-Compton (SSC) or external Compton (EC) leptonic jet models.

AB - We report the detection of very high energy 7-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae (z=p 0.102) by VERITAS. The source was observed between 2008 January and April. A strong outburst of 7-ray emission was measured in the middle of March, lasting for only 4 days. The energy spectrum measured during the two highest flare nights is fit by a power law and is found to be very steep, with a differential photon spectral index of ×=3.81 ± 0.35stat ± 0.34syst. The integral photon flux above 200 GeV during those two nights corresponds to roughly 9% of the flux from the Crab Nebula. Quasi-simultaneous Swift observations at X-ray energies were triggered by the VERITAS observations. The spectral energy distribution of the flare data can be described by synchrotron self-Compton (SSC) or external Compton (EC) leptonic jet models.

KW - BL Lacertae objects: Individual (W Comae)

KW - Gamma rays: Observations

UR - http://www.scopus.com/inward/record.url?scp=64849111288&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=64849111288&partnerID=8YFLogxK

U2 - 10.1086/592244

DO - 10.1086/592244

M3 - Article

AN - SCOPUS:64849111288

SN - 0004-637X

VL - 684

SP - L73-L77

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 2

ER -

Veritas discovery of 1200 gev gamma-ray emission from the intermediate-frequency-peaked bl lacertae object w comae

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Keywords

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