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On the relative surface density change of thermally unstable accretion disks
Wu, XB; Wu, XB , CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA.
1997
发表期刊ASTROPHYSICAL JOURNAL
ISSN0004-637X
卷号489期号:1页码:222-226
摘要The relations among the relative changes of surface density, temperature, disk height, and vertically integrated pressure in three kinds of thermally unstable accretion disks are quantitatively investigated, assuming local perturbations. The surface density change is found to be very small in the long perturbation wavelength case but cannot be ignored in the short-wavelength case. It becomes significant in an optically thin, radiative cooling-dominated disk when the perturbation wavelength is shorter than 15H (where H is the scale height of disk) and in a geometrically thin, optically thick and radiation pressure-dominated disk when the perturbation wavelength is shorter than 50H. In an optically thick, advection-dominated disk, which is thermally unstable against short-wavelength perturbations, the relative surface density change is much larger. We prove the positive correlation between the changes of surface density and temperature in an optically thick, advection-dominated disk that has previously been claimed to be the essential point of its thermal instability. Moreover, we find an anticorrelation between the changes of disk height and temperature in an optically thick, advection-dominated disk. This is the natural result of the absence of appreciable vertically integrated pressure change.
部门归属CHINESE ACAD SCI,BEIJING ASTRON OBSERV,BEIJING 100080,PEOPLES R CHINA
关键词Advection-dominated Accretion Black-holes Binary-systems Instability Stability Model
学科领域Physics
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收录类别SCI
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/12411
专题理论物理所1978-2010年知识产出
通讯作者Wu, XB , CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA.
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Wu, XB,Wu, XB , CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA.. On the relative surface density change of thermally unstable accretion disks[J]. ASTROPHYSICAL JOURNAL,1997,489(1):222-226.
APA Wu, XB,&Wu, XB , CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA..(1997).On the relative surface density change of thermally unstable accretion disks.ASTROPHYSICAL JOURNAL,489(1),222-226.
MLA Wu, XB,et al."On the relative surface density change of thermally unstable accretion disks".ASTROPHYSICAL JOURNAL 489.1(1997):222-226.
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