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Intrinsic constraints on very high energy emission in gamma-ray-loud blazars
Wang JM(王建民); Wang, JM
2000
发表期刊ASTROPHYSICAL JOURNAL
卷号538期号:1页码:#REF!
通讯作者Wang, JM (reprint author), Chinese Acad Sci, Inst High Energy Phys, Lab Cosm Ray & High Energy Astrophys, Beijing 100039, Peoples R China.
文章类型Article
摘要Photons with very high energy (VHE) up to TeV emitted from active galactic nuclei (AGNs) provide some invaluable information on the origin of gamma-ray emission. Although 66 blazars have been detected by EGRET, only three low-redshift X-ray-selected BL Lac objects (Mrk 421, Mrk 501, and 1ES 2344+514) are conclusive TeV emitters (PKS 2155-304 is a potential TeV emitter), since VHE photons may be absorbed by cosmological background infrared photons (external absorption). Based on the "mirror" effect of clouds in the broad-line region, we argue that there is an intrinsic mechanism for the deficiency of TeV emission in blazars. Employing the observable quantities, we derive the pair production optical depth tau(gamma gamma)(epsilon(obs)) due to the interaction of VHE photons with the reflected synchrotron photons by electron Thomson scattering in the broad-line region. This sets stronger constraints on very high energy emission, and provides a sensitive upper limit on the Doppler factor of the relativistic bulk motion. It has been suggested that the intrinsic absorption be distinguished from the external by the observation on variation of the multiwavelength continuum.
关键词gamma rays : theory radiation mechanisms : nonthermal
学科领域Astronomy & Astrophysics
DOI10.1086/309105
收录类别SCI
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000088706000019
引用统计
被引频次:6[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/311005/226736
专题粒子天体物理中心
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Wang JM,Wang, JM. Intrinsic constraints on very high energy emission in gamma-ray-loud blazars[J]. ASTROPHYSICAL JOURNAL,2000,538(1):#REF!.
APA 王建民,&Wang, JM.(2000).Intrinsic constraints on very high energy emission in gamma-ray-loud blazars.ASTROPHYSICAL JOURNAL,538(1),#REF!.
MLA 王建民,et al."Intrinsic constraints on very high energy emission in gamma-ray-loud blazars".ASTROPHYSICAL JOURNAL 538.1(2000):#REF!.
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