Spectral constraints on unidentified EGRET gamma-ray sources from COMPTEL MeV observations
Zhang S(张澍); Zhang, S; Collmar, W; Hermsen, W; Schonfelder, V
刊名ASTRONOMY & ASTROPHYSICS
2004
卷号421期号:3页码:983-990
关键词gamma-rays : observations
学科分类Astronomy & Astrophysics
DOI10.1051/0004-6361:20035671
通讯作者Max Planck Inst Extraterr Phys, D-85740 Garching, Germany ; Inst High Energy Phys, Lab Cosm Ray & High Energy Astrophys, Beijing 100039, Peoples R China ; SRON Natl Inst Space Res, NL-3584 CA Utrecht, Netherlands ; Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands
文章类型Article
英文摘要We investigated the MeV properties of 173 unidentified or tentatively identified EGRET sources listed in the third EGRET catalogue by analyzing the simultaneously collected COMPTEL MeV data for each individual source. The sources can be divided into 4 groups. In this paper we focus on one of these, a group of 22 EGRET sources for which we can provide additional constraining information: their spectral extrapolations from the energy range above 100 MeV towards lower energies overshoot the fluxes or upper limits derived simultaneously at MeV energies. This means that for these sources a spectral turnover/break between 1 MeV and 100 MeV is required. At least two of these sources, but most likely the majority of this sample, have the maxima of their gamma-ray luminosities in this energy band. The sources have rather soft EGRET spectra (average photon index=2.72(-0.11)(+0.08)), and seem to spatially cluster in the inner Galaxy. Variability analyses revealed 11 out of the 22 sources to be significantly variable. Object classes proposed as possible counterparts for the unidentified EGRET sources are discussed in the light of these additional constraints.
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS记录号WOS:000223249700019
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被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238836
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
中国科学院高能物理研究所_粒子天体物理中心
作者单位中国科学院高能物理研究所
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Zhang S,Zhang, S,Collmar, W,et al. Spectral constraints on unidentified EGRET gamma-ray sources from COMPTEL MeV observations[J]. ASTRONOMY & ASTROPHYSICS,2004,421(3):983-990.
APA 张澍,Zhang, S,Collmar, W,Hermsen, W,&Schonfelder, V.(2004).Spectral constraints on unidentified EGRET gamma-ray sources from COMPTEL MeV observations.ASTRONOMY & ASTROPHYSICS,421(3),983-990.
MLA 张澍,et al."Spectral constraints on unidentified EGRET gamma-ray sources from COMPTEL MeV observations".ASTRONOMY & ASTROPHYSICS 421.3(2004):983-990.
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