ABSORPTION OF 10 GeV-1 TeV GAMMA RAYS BY RADIATION FROM THE BROAD-LINE REGION IN 3C 279

doi:10.1086/592039

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	ABSORPTION OF 10 GeV-1 TeV GAMMA RAYS BY RADIATION FROM THE BROAD-LINE REGION IN 3C 279
	Liu HT(刘洪涛)1 ; Bai JM(白金明)1 ; Ma, L2 ; Liu, HT (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Yunnan, Peoples R China.
发表期刊	ASTROPHYSICAL JOURNAL
	2008-11-20
卷号	688 期号:1 页码:148-158
DOI	10.1086/592039
产权排序	第1完成单位
收录类别	SCI
关键词	Gamma Rays: Theory Quasars: Individual (3c 279)
摘要	We study the photon-photon pair production optical depth for 10 GeV-1 TeV gamma rays from 3C 279 due to the diffuse radiation of the broad-line region (BLR). Assuming a power-law spectrum a(1)E(gamma)(2)(-a) for the photon intensity of very high energy gamma rays, a(1) greater than or similar to 405 and a(2) greater than or similar to 6.4 are inferred from the integrated photon fluxes measured by MAGIC and H. E. S. S. Based on this power-law spectrum, the preabsorbed spectra are calculated by correcting for photon-photon absorption on the diffuse photons of the BLR (internal absorption) and the extragalactic background light (external absorption). The position of the gamma-ray-emitting region, R-gamma, determines the relative contributions of these two diffuse radiation components to the total absorption for 10 GeV-1 TeV gamma rays. The internal absorption could make the spectral shape of the gamma rays more complex than if they were corrected only for external absorption and could lead to the formation of arbitrarily softening and hardening gamma-ray spectra. It should be requisite for the internal absorption to be considered in studying 10 GeV-1 TeV gamma rays from powerful blazars. The energy of the annihilated gamma-ray photons due to the internal absorption is likely to be mainly reradiated around GeV energies. Our results indicate that R-gamma may lie between the inner and outer radii of the BLR for 3C 279. This implies for powerful blazars that R-gamma might be neither inside the BLR cavity nor outside the BLR, but within the BLR shell. Observations by GLAST, MAGIC, H. E. S. S., and VERITAS in the near future could provide more constraints on the position of the gamma-ray-emitting region relative to 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	2008-11-11
WOS记录号	WOS:000260769700015
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	EXTRAGALACTIC BACKGROUND LIGHT ; ACTIVE GALACTIC NUCLEI ; INTERGALACTIC INFRARED RADIATION ; 2ND EGRET CATALOG ; BLACK-HOLE SPIN ; X-RAY ; ACCRETION DISK ; BLAZAR 3C-279 ; SYNCHROTRON RADIATION ; MULTIWAVELENGTH OBSERVATIONS
引用统计	被引频次：30[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/114a53/5383
专题	南方基地
通讯作者	Liu, HT (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Yunnan, Peoples R China.
作者单位	1.National Astronomical Observatories /Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, 650011 Yunnan, China 2.Department of Physics, Yunnan Normal University, Kunming, 650092 Yunnan, 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,Ma, L,et al. ABSORPTION OF 10 GeV-1 TeV GAMMA RAYS BY RADIATION FROM THE BROAD-LINE REGION IN 3C 279[J]. ASTROPHYSICAL JOURNAL,2008,688(1):148-158.
APA	Liu HT,Bai JM,Ma, L,&Liu, HT .(2008).ABSORPTION OF 10 GeV-1 TeV GAMMA RAYS BY RADIATION FROM THE BROAD-LINE REGION IN 3C 279.ASTROPHYSICAL JOURNAL,688(1),148-158.
MLA	Liu HT,et al."ABSORPTION OF 10 GeV-1 TeV GAMMA RAYS BY RADIATION FROM THE BROAD-LINE REGION IN 3C 279".ASTROPHYSICAL JOURNAL 688.1(2008):148-158.

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