Spectrum of very high energy gamma-rays from the blazar 1ES 1959+650 during flaring activity in 2002

被引：44

作者：

Daniel, MK ^{[1
]}

Badran, HM

Bond, IH

Boyle, PJ

Bradbury, SM

Buckley, JH

Carter-Lewis, DA

Catanese, M

Celik, O

Cogan, P

Cui, W

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

Humensky, TB

Jarvis, A

Jordan, M

Kenny, GE

Kertzman, M

Kieda, D

Kildea, J

Knapp, J

Kosack, K

Krawczynski, H

Krennrich, F

Lang, MJ

Le Bohec, S

Linton, E

Lloyd-Evans, J

Milovanovic, A

Moriarty, P

Müller, D

Nagai, T

Nolan, S

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] Natl Univ Ireland, Expt Phys Dept, Dublin 4, Ireland

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

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

[11] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

[12] Natl Univ Ireland, Dept Phys, Galway, Ireland

[13] Univ Utah, High Energy Astrophys Inst, Salt Lake City, UT USA

[14] Univ Arkansas, Dept Phys & Astron, Little Rock, AR 72204 USA

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

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

[17] Galway Mayo Inst Technol, Sch Sci, Galway, Ireland

[18] Univ Maryland Baltimore Cty, Baltimore, MD 21228 USA

[19] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

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

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 621卷 / 01期

关键词：

BL Lacertae objects : individual (1ES 1959+650); gamma rays : observations; techniques : spectroscopic;

D O I：

10.1086/427406

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cerenkov Telescope in 2002 May. A spectral analysis has been carried out on the data from that time period, and the resulting very high energy gamma-ray spectrum (E greater than or equal to 316 GeV) can be well fitted by a power law of differential spectral index alpha = 2.78 +/- 0.12(stat) +/- 0.21(sys). On 2002 June 4, the source flared dramatically in the gamma-ray range without any coincident increase in the X-ray emission, providing the first unambiguous example of an "orphan'' gamma-ray flare from a blazar. The gamma-ray spectrum for these data can also be described by a simple power-law fit with alpha = 2.82 +/- 0.15(stat) +/- 0.30(sys). There is no compelling evidence for spectral variability or for any cutoff to the spectrum.

引用

页码：181 / 187

页数：7

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