Absorption of 10-200 GeV gamma rays by radiation from broad-line regions in blazars

doi:10.1086/509097

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	Absorption of 10-200 GeV gamma rays by radiation from broad-line regions in blazars
	Liu HT(刘洪涛)1,2 ; Bai JM(白金明)1 ; Liu, HT (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming, Yunnan, Peoples R China.
发表期刊	ASTROPHYSICAL JOURNAL
	2006-12-20
卷号	653 期号:2 页码:1089-1097
DOI	10.1086/509097
产权排序	第1完成单位
收录类别	SCI
关键词	Bl Lacertae Objects : General Gamma Rays : Theory
摘要	In this paper, we study the photon-photon pair production optical depth for gamma rays with energies from 10 to 200 GeV emitted by powerful blazars due to the diffuse radiation field of the broad-line region (BLR). There are four key parameters in the BLR model employed to determine the gamma-gamma attenuation optical depth of these gamma rays. They are the gamma-ray emitting radius R-gamma, the BLR luminosity L-BLR, the BLR half thickness h, and the ratio tau(BLR)/f(cov) of the Thomson optical depth to the covering factor of BLR. For FSRQs, on average, it is impossible for gamma rays with energies from 10 to 200 GeV to escape from the diffuse radiation field of the BLR. If GLAST could detect these gamma rays for most of FSRQs, the gamma-ray emitting region is likely to be outside the cavity formed by the BLR. Otherwise, the emitting region is likely to be inside the BLR cavity. As examples, we estimate the photon-photon absorption optical depth of gamma rays with energies from 10 to 200 GeV for two powerful blazars, HFSRQ PKS 0405-123 and FSRQ 3C 279. Comparing our results with GLAST observations in the future could test whether the model employed and the relevant assumptions in this paper are reliable and reasonable, and then limit constraints on the position of the gamma-ray emitting region relative to the BLR and the properties of the BLR.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-637X
URL	查看原文
归档日期	2006-12-15
WOS记录号	WOS:000242955200020
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; 2ND EGRET CATALOG ; EMISSION-LINES ; PAIR CASCADES ; RADIO QUASARS ; TELESCOPE ; HESS ; LUMINOSITY ; SCHEMES ; PHOTONS
引用统计	被引频次：111[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4943
专题	高能天体物理研究组
通讯作者	Liu, HT (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming, Yunnan, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Astronomical Observatory, the Chinese Academy of Sciences, Kunming, Yunnan, China 2.Graduate School of the Chinese Academy of Sciences, Beijing, China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Liu HT,Bai JM,Liu, HT . Absorption of 10-200 GeV gamma rays by radiation from broad-line regions in blazars[J]. ASTROPHYSICAL JOURNAL,2006,653(2):1089-1097.
APA	Liu HT,Bai JM,&Liu, HT .(2006).Absorption of 10-200 GeV gamma rays by radiation from broad-line regions in blazars.ASTROPHYSICAL JOURNAL,653(2),1089-1097.
MLA	Liu HT,et al."Absorption of 10-200 GeV gamma rays by radiation from broad-line regions in blazars".ASTROPHYSICAL JOURNAL 653.2(2006):1089-1097.

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