Veritas observations of the γ-ray binary LS I+61 303

被引：143

作者：

Acciari, V. A. ^{[1
,2
]}

Beilicke, M. ^{[3
]}

Blaylock, G. ^{[4
]}

Bradbury, S. M. ^{[5
]}

Buckley, J. H. ^{[3
]}

Bugaev, V. ^{[3
]}

Butt, Y. ^{[6
]}

Byrum, K. L. ^{[7
]}

Celik, O. ^{[8
]}

Cesarini, A. ^{[2
,9
]}

Ciupik, L. ^{[10
]}

Chow, Y. C. K. ^{[8
]}

Cogan, P. ^{[17
]}

Colin, P. ^{[12
]}

Cui, W. ^{[13
]}

Daniel, M. K. ^{[5
]}

Duke, C. ^{[14
]}

Ergin, T. ^{[4
]}

Falcone, A. D. ^{[15
]}

Fegan, S. J. ^{[8
]}

Finley, J. P. ^{[13
]}

Fortin, P. ^{[16
]}

Fortson, L. F. ^{[10
]}

Gall, D. ^{[13
]}

Gibbs, K. ^{[2
]}

Gillanders, G. H. ^{[9
]}

Grube, J. ^{[5
]}

Guenette, R. ^{[17
]}

Hanna, D. ^{[17
]}

Hays, E. ^{[2
,7
]}

Holder, J. ^{[18
]}

Horan, D. ^{[7
]}

Hughes, S. B. ^{[3
]}

Hui, C. M. ^{[12
]}

Humensky, T. B. ^{[11
]}

Kaaret, P. ^{[19
]}

Kieda, D. B. ^{[12
]}

Kildea, J. ^{[2
]}

Konopelko, A. ^{[13
]}

Krawczynski, H. ^{[3
]}

Krennrich, F. ^{[20
]}

Lang, M. J. ^{[9
]}

LeBohec, S. ^{[12
]}

Lee, K. ^{[3
]}

Maier, G. ^{[17
]}

McCann, A. ^{[17
]}

McCutcheon, M. ^{[17
]}

Millis, J. ^{[13
]}

Moriarty, P. ^{[1
]}

Mukherjee, R. ^{[16
]}

机构：

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

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

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

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

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

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

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

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

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

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

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

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

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

[14] Grinnell Coll, Dept Phys, Grinnell, IA 50112 USA

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

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

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

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

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

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

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

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

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

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

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 679卷 / 02期

关键词：

acceleration of particles; binaries : general; gamma rays : observations; stars : individual (LS I+61 303);

D O I：

10.1086/587736

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy gamma-rays. The system was observed over several orbital cycles ( between 2006 September and 2007 February) with the VERITAS array of imaging air Cerenkov telescopes. A signal of gamma-rays with energies above 300 GeV is found with a statistical significance of 8.4 standard deviations. The detected flux is measured to be strongly variable; the maximum flux is found during most orbital cycles at apastron. The energy spectrum for the period of maximum emission can be characterized by a power law with a photon index of Gamma = 2.40 +/- 0.16(stat) +/- 0.2(sys) and a flux above 300 GeV corresponding to 15% - 20% of the flux from the Crab Nebula.

引用

页码：1427 / 1432

页数：6

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