Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS

被引：84

作者：

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

Beilicke, M. ^{[3
]}

Blaylock, G. ^{[4
]}

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

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

Bugaev, V. ^{[3
]}

Butt, Y. ^{[6
]}

Celik, O. ^{[7
]}

Cesarini, A. ^{[8
]}

Ciupik, L. ^{[9
]}

Cogan, P. ^{[10
]}

Colin, P. ^{[1
]}

Cui, W. ^{[11
]}

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

Duke, C. ^{[12
]}

Ergin, T. ^{[4
]}

Falcone, A. D. ^{[13
]}

Fegan, S. J. ^{[7
]}

Finley, J. P. ^{[11
]}

Finnegan, G. ^{[1
]}

Fortin, P. ^{[14
]}

Fortson, L. F. ^{[9
]}

Gibbs, K. ^{[6
]}

Gillanders, G. H. ^{[8
]}

Grube, J. ^{[5
]}

Guenette, R. ^{[10
]}

Gyuk, G. ^{[9
]}

Hanna, D. ^{[10
]}

Hays, E. ^{[15
,16
]}

Holder, J. ^{[17
,18
]}

Horan, D. ^{[16
]}

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

Hui, M. C. ^{[2
]}

Humensky, T. B. ^{[15
]}

Imran, A. ^{[19
]}

Kaaret, P. ^{[20
]}

Kertzman, M. ^{[21
]}

Kieda, D. B. ^{[1
]}

Kildea, J. ^{[6
]}

Konopelko, A.

Krawczynski, H. ^{[3
]}

Krennrich, F. ^{[19
]}

Lang, M. J. ^{[8
]}

LeBohec, S. ^{[1
]}

Lee, K. ^{[3
]}

Maier, G.

McCann, A. ^{[10
]}

McCutcheon, M. ^{[10
]}

Millis, J. ^{[11
]}

Moriarty, P. ^{[2
]}

机构：

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

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

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

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

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

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

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

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

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

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

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

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

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

[17] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[18] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA

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

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

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

[22] Univ Coll Dublin, Sch Phys, Dublin 4, Ireland

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

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

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

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 679卷 / 01期

关键词：

galaxies; individual; (M87; NGC; 4486; Virgo A); gamma rays : observations;

D O I：

10.1086/587458

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in active galactic nuclei from radio waves to TeV gamma-rays. Here we report the detection of gamma-ray emission above 250 GeV from M87 in spring 2007 with the VERITAS atmospheric Cerenkov telescope array and discuss its correlation with the X-ray emission. The gamma-ray emission is measured to be pointlike with an intrinsic source radius less than 4.5'. The differential energy spectrum is fitted well by a power-law function: d Phi/dE = (7.4 +/- 1.3(stat) +/- 1.5(sys))(E/TeV)((-2.31 +/- 0.17stat +/- 0.2sys)) 10(-9) m(-2) s(-1) TeV-1. We show strong evidence for a year-scale correlation between the gamma-ray flux reported by TeV experiments and the X-ray emission measured by the ASM RXTE observatory, and discuss the possible short-timescale variability. These results imply that the gamma-ray emission from M87 is more likely associated with the core of the galaxy than with other bright X-ray features in the jet.

引用

页码：397 / 403

页数：7

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