Observation of M87 at 400 GeV with the Whipple 10 meter telescope

被引:15
|
作者
Le Bohec, S [1 ]
Badran, HM
Bond, IH
Boyle, PJ
Bradbury, SM
Buckley, JH
Carter-Lewis, DA
Catanese, M
Celik, O
Cui, W
Daniel, M
D'Vali, M
Perez, ID
Duke, C
Falcone, A
Fegan, DJ
Fegan, SJ
Finley, JP
Fortson, LF
Gaidos, JA
Gammell, S
Gibbs, K
Gillanders, GH
Grube, J
Hall, J
Hall, TA
Hanna, D
Hillas, AM
Holder, J
Horan, D
Jarvis, A
Jordan, M
Kenny, GE
Kertzman, M
Kieda, D
Kildea, J
Knapp, J
Kosack, K
Krawczynski, H
Krennrich, F
Lang, MJ
Linton, E
Lloyd-Evans, J
Milovanovic, A
Moriarty, P
Müller, D
Nagai, T
Nolan, S
Ong, RA
Pallassini, R
机构
[1] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
[2] Tanta Univ, Dept Phys, Tanta, Egypt
[3] Univ Leeds, Dept Phys, Leeds LS2 9JT, W Yorkshire, England
[4] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
[5] Washington Univ, Dept Phys, St Louis, MO 63130 USA
[6] Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA
[7] Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90095 USA
[8] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA
[9] Grinnell Coll, Dept Phys, Grinnell, IA 50112 USA
[10] Natl Univ Ireland, Expt Phys Dept, Dublin 4, Ireland
[11] Natl Univ Ireland, Dept Phys, Galway, Ireland
[12] Univ Utah, High Energy Astrophys Inst, Salt Lake City, UT 84112 USA
[13] Univ Arkansas, Dept Phys & Astron, Little Rock, AR 72204 USA
[14] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
[15] DePauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA
[16] Galway Mayo Inst Technol, Sch Sci, Galway, Ireland
[17] Univ Maryland Baltimore Cty, Baltimore, MD 21250 USA
[18] Cork Inst Technol, Dept Appl Phys & Instrumentat, Cork, Ireland
来源
ASTROPHYSICAL JOURNAL | 2004年 / 610卷 / 01期
关键词
galaxies : active; galaxies : individual (M87); gamma rays : observations;
D O I
10.1086/421697
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present results from observations taken with the Whipple 10 m very high energy gamma-ray telescope with maximal sensitivity at 400 GeV during 39 hr between 2000 and 2003 in the direction of the giant radio galaxy M87. Using the entire data set, we derive a 99% confidence level upper limit on the flux of gamma-ray emission above 400 GeV from M87 to be less than or equal to 6: 9; 10(-1)2 cm(-2) s(-1). This suggests variability at the 90% confidence level when compared to the flux measured by the HEGRA collaboration in 1999 if the differential spectrum is steeper than a power law of index 3.75. Our search for a correlation between the Rossi X-Ray Timing Explorer all-sky monitor observation and a potential gamma-ray signal is inconclusive.
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页码:156 / 160
页数:5
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