VERITAS discovery of >200 GeV gamma-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae

被引：93

作者：

Acciari, V. A. ^{[19
,26
]}

Aliu, E. ^{[22
]}

Beilicke, M. ^{[1
]}

Benbow, W. ^{[26
]}

Boettcher, M. ^{[25
]}

Bradbury, S. M. ^{[3
]}

Buckley, J. H. ^{[1
]}

Bugaev, V. ^{[1
]}

Butt, Y. ^{[23
]}

Celik, O. ^{[5
]}

Cesarini, A. ^{[20
,26
]}

Ciupik, L. ^{[6
]}

Chow, Y. C. K. ^{[5
]}

Cogan, P. ^{[11
]}

Colin, P. ^{[10
]}

Cui, W. ^{[7
]}

Daniel, M. K. ^{[3
]}

Ergin, T. ^{[2
]}

Falcone, A. D. ^{[21
]}

Fegan, S. J. ^{[5
]}

Finley, J. P. ^{[7
]}

Finnegan, G. ^{[10
]}

Fortin, P. ^{[13
]}

Fortson, L. F. ^{[6
]}

Furniss, A. ^{[15
,16
]}

Gall, D. ^{[7
]}

Gillanders, G. H. ^{[20
]}

Grube, J. ^{[12
]}

Guenette, R. ^{[11
]}

Gyuk, G. ^{[6
]}

Hanna, D. ^{[11
]}

Hays, E. ^{[4
,26
]}

Holder, J. ^{[22
]}

Horan, D. ^{[4
]}

Hui, C. M. ^{[10
]}

Humensky, T. B. ^{[9
]}

Imran, A. ^{[8
]}

Kaaret, P.

Karlsson, N. ^{[6
]}

Kertzman, M. ^{[14
]}

Kieda, D. B. ^{[10
]}

Konopelko, A. ^{[7
]}

Krawczynski, H. ^{[1
]}

Krennrich, F. ^{[8
]}

Lang, M. J. ^{[20
]}

LeBohec, S. ^{[10
]}

Lee, K. ^{[1
]}

Maier, G. ^{[11
]}

McCann, A.

McCutcheon, M. ^{[11
]}

机构：

[1] Washington Univ, Dept Phys, St Louis, MO 63130 USA

[2] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[3] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

[4] Argonne Natl Lab, Argonne, IL 60439 USA

[5] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[6] Adler Planetarium & Astron Museum, Dept Astron, Chicago, IL 60605 USA

[7] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA

[8] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[9] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[10] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA

[11] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[12] Univ Coll Dublin, Sch Phys, Dublin 2, Ireland

[13] Columbia Univ Barnard Coll, Dept Phys & Astron, New York, NY 10027 USA

[14] Depauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA

[15] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

[16] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

[17] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[18] Cork Inst Technol, Dept Appl Phys & Instrumentat, Cork, Ireland

[19] Galway Mayo Inst Technol, Dept Life & Phys Sci, Galway, Ireland

[20] Natl Univ Ireland Univ Coll Galway, Dept Phys, Galway, Ireland

[21] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[22] Univ Delaware, Bartol Res Inst, Dept Phys & Astron, Newark, DE 19716 USA

[23] Smithsonian Astrophys Observ, Cambridge, MA 02138 USA

[24] Max Planck Inst Extraterr Phys MPE, D-85748 Garching, Germany

[25] Ohio Univ, Inst Astrophys, Dept Phys & Astron, Athens, OH 45701 USA

[26] Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 684卷 / 02期

基金：

加拿大自然科学与工程研究理事会; 爱尔兰科学基金会; 美国国家科学基金会;

关键词：

BL Lacertae objects : individual (W Comae); gamma rays : observations;

D O I：

10.1086/592244

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of very high energy gamma- ray emission from the intermediate- frequency- peaked BL Lacertae object W Comae (z = 0.102) by VERITAS. The source was observed between 2008 January and April. A strong outburst of gamma-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 Gamma = 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.

引用

页码：L73 / L77

页数：5

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VERITAS discovery of &gt;200 GeV gamma-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae

VERITAS discovery of >200 GeV gamma-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae