Intrinsic constraints on very high energy emission in gamma-ray-loud blazars

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	Intrinsic constraints on very high energy emission in gamma-ray-loud blazars
	Wang JM(王建民); Wang, JM
刊名	ASTROPHYSICAL JOURNAL
	2000
卷号	538 期号:1 页码:#REF!
关键词	gamma rays : theory radiation mechanisms : nonthermal
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.
英文摘要	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.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000088706000019
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/226736]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	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!.