EMERGENT SPECTRA FROM DISKS SURROUNDING KERR BLACK HOLES: EFFECT OF PHOTON TRAPPING AND DISK SELF-SHADOWING

	EMERGENT SPECTRA FROM DISKS SURROUNDING KERR BLACK HOLES: EFFECT OF PHOTON TRAPPING AND DISK SELF-SHADOWING
	Li, Guang-Xing 1,2; Yuan, Ye-Fei 1,2; Cao, Xinwu3
刊名	ASTROPHYSICAL JOURNAL
	2010-05-20
卷号	715 期号:1 页码:623-635
关键词	accretion binaries: close black hole physics X-rays: stars accretion disks
英文摘要	Based on a new estimation of their thickness, the global properties of relativistic slim accretion disks are investigated in this work. The resulting emergent spectra are calculated using the relativistic ray-tracing method, in which we neglect the self-irradiation of the accretion disk. The angular dependence of the disk luminosity, the effects of the heat advection, and the disk thickness on the estimation of the black hole spin are discussed. Compared with the previous works, our improvements are that we use the self-consistent disk equations and we consider the disk self-shadowing effect. We find that at the moderate accretion rate, the radiation trapped in the outer region of the accretion disks will escape in the inner region of the accretion disk and contribute to the emergent spectra. At the high accretion rate, for the large inclination and large black hole spin, both the disk thickness and the heat advection have significant influence on the emergent spectra. Consequently, these effects will influence the measurement of the black hole spin based on the spectra fitting and influence the angular dependence of the luminosity. For the disks around Kerr black holes with a = 0.98, if the disk inclination is greater than 60 degrees, and their luminosity is beyond 0.2 Eddington luminosity, the spectral model which is based on the relativistic standard accretion disk is no longer applicable for the spectra fitting. We also confirm that the effect of the self-shadowing is significantly enhanced by the light bending, which implies that the non-relativistic treatment of the self-shadowing is inaccurate. According to our results, the observed luminosity dependence of the measured spin suggests that the disk self-shadowing significantly shapes the spectra of GRS 1915+105, which might lead to the underestimation of the black hole spin for the high luminosity states.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; SLIM ACCRETION DISKS ; X-RAY BINARIES ; VERTICAL STRUCTURE ; FLOWS ; SPIN ; EMISSION ; MODELS ; GRS-1915+105 ; DISSIPATION
收录类别	SCI
语种	英语
WOS记录号	WOS:000277216100052
公开日期	2011-06-29
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/13359]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Chinese Acad Sci, Hefei 230026, Peoples R China 2.Univ Sci & Technol China, Ctr Astrophys, Dept Astron, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Li, Guang-Xing,Yuan, Ye-Fei,Cao, Xinwu. EMERGENT SPECTRA FROM DISKS SURROUNDING KERR BLACK HOLES: EFFECT OF PHOTON TRAPPING AND DISK SELF-SHADOWING[J]. ASTROPHYSICAL JOURNAL,2010,715(1):623-635.
APA	Li, Guang-Xing,Yuan, Ye-Fei,&Cao, Xinwu.(2010).EMERGENT SPECTRA FROM DISKS SURROUNDING KERR BLACK HOLES: EFFECT OF PHOTON TRAPPING AND DISK SELF-SHADOWING.ASTROPHYSICAL JOURNAL,715(1),623-635.
MLA	Li, Guang-Xing,et al."EMERGENT SPECTRA FROM DISKS SURROUNDING KERR BLACK HOLES: EFFECT OF PHOTON TRAPPING AND DISK SELF-SHADOWING".ASTROPHYSICAL JOURNAL 715.1(2010):623-635.