Global Structure of Optically Thin, Magnetically Supported, Two-Temperature, Black Hole Accretion Disks

	Global Structure of Optically Thin, Magnetically Supported, Two-Temperature, Black Hole Accretion Disks
	Oda, Hiroshi 1; Machida, Mami 2; Nakamura, Kenji E.3; Matsumoto, Ryoji 4; Narayan, Ramesh 5
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
	2012-02-25
卷号	64 期号:1 页码:1
关键词	accretion black hole physics magnetic fields radiation mechanisms: non-thermal accretion disks
英文摘要	We present global solutions of optically thin, two-temperature black hole accretion disks incorporating magnetic fields. We assume that the (omega) over bar phi-component of the Maxwell stress is proportional to the total pressure, and prescribe the radial dependence of the magnetic flux advection rate in order to complete the set of basic equations. We obtained magnetically supported (low-beta) disk solutions, whose luminosity exceeds the maximum luminosity for an advection-dominated accretion flow (ADAF), L greater than or similar to 0.4 alpha L-2(Edd), where L-Edd is the Eddington luminosity. The accretion flow is composed of the outer ADAF, a luminous hot accretion flow (LHAF) inside the transition layer from the outer ADAF to the low-beta disk, the low-beta disk, and the inner ADAF. The low-beta disk region becomes wider as the mass-accretion rate increases further. In the low-beta disk, the magnetic heating balances the radiative cooling, and the electron temperature decreases from similar to 10(9.5) K to similar to 10(8) K as the luminosity increases. These results are consistent with the anti-correlation between the energy cutoff in X-ray spectra (hence the electron temperature) and the luminosity when L greater than or similar to 0.1 L-Edd, observed in the bright/hard state during the bright hard-to-soft transitions of transient outbursts in galactic black hole candidates.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ADVECTION-DOMINATED ACCRETION ; X-RAY BINARIES ; SELF-SIMILAR SOLUTION ; CYGNUS X-1 ; THERMAL EQUILIBRIA ; MAGNETOHYDRODYNAMIC SIMULATIONS ; SPECTRAL TRANSITIONS ; GAS-PRESSURE ; HARD STATE ; FLOWS
收录类别	SCI
语种	英语
WOS记录号	WOS:000301307500015
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18151]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Kyushu Univ, Dept Phys, Fac Sci, Higashi Ku, Fukuoka 8128581, Japan 3.Kyushu Sangyo Univ, Fac Engn, Dept Mech Engn, Higashi Ku, Fukuoka 8138503, Japan 4.Chiba Univ, Grad Sch Sci, Dept Phys, Inage Ku, Chiba 2638522, Japan 5.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
推荐引用方式 GB/T 7714	Oda, Hiroshi,Machida, Mami,Nakamura, Kenji E.,et al. Global Structure of Optically Thin, Magnetically Supported, Two-Temperature, Black Hole Accretion Disks[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2012,64(1):1.
APA	Oda, Hiroshi,Machida, Mami,Nakamura, Kenji E.,Matsumoto, Ryoji,&Narayan, Ramesh.(2012).Global Structure of Optically Thin, Magnetically Supported, Two-Temperature, Black Hole Accretion Disks.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,64(1),1.
MLA	Oda, Hiroshi,et al."Global Structure of Optically Thin, Magnetically Supported, Two-Temperature, Black Hole Accretion Disks".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 64.1(2012):1.