REVISITING THE THERMAL STABILITY OF RADIATION-DOMINATED THIN DISKS
文献类型：期刊论文
| 作者 | Zheng, Sheng-Ming1,2; Yuan, Feng3 ; Gu, Wei-Min1,2; Lu, Ju-Fu1,2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2011-05-01 |
| 卷号 | 732期号:1 |
| 关键词 | accretion black hole physics instabilities accretion disks |
| 英文摘要 | The standard thin disk model predicts that when the accretion rate is over a small fraction of the Eddington rate, which corresponds to L greater than or similar to 0.06 L-Edd, the inner region of the disk is radiation-pressure dominated and thermally unstable. However, observations of the high/soft state of black hole X-ray binaries with luminosity well within this regime (0.01L(Edd) less than or similar to L less than or similar to 0.5L(Edd)) indicate that the disk has very little variability, i.e., it is quite stable. Recent radiation magnetohydrodynamic simulations of a vertically stratified shearing box have confirmed the absence of the thermal instability. In this paper, we revisit the thermal stability by linear analysis, taking into account the role of magnetic field in the accretion flow. By assuming that the field responds negatively to a positive temperature perturbation, we find that the threshold of accretion rate above which the disk becomes thermally unstable increases significantly compared with the case of not considering the role of magnetic field. This accounts for the stability of the observed sources with high luminosities. Our model also presents a possible explanation as to why only GRS 1915+105 seems to show thermally unstable behavior. This peculiar source holds the highest accretion rate (or luminosity) among the known high state sources, which is well above the accretion rate threshold of the instability. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | HOLE ACCRETION DISKS ; 3-DIMENSIONAL MAGNETOHYDRODYNAMIC SIMULATIONS ; LIMIT-CYCLE BEHAVIOR ; BLACK-HOLE ; GALACTIC NUCLEI ; BINARY-SYSTEMS ; INSTABILITY ; TURBULENCE ; VARIABILITY ; EQUILIBRIA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000289626500052 |
| 公开日期 | 2014-10-08 |
| 源URL | [http://119.78.226.72//handle/331011/15324]  |
| 专题 | 上海天文台_行星科学重点实验室 |
| 作者单位 | 1.Xiamen Univ, Dept Phys, Xiamen 361005, Fujian, Peoples R China 2.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zheng, Sheng-Ming,Yuan, Feng,Gu, Wei-Min,et al. REVISITING THE THERMAL STABILITY OF RADIATION-DOMINATED THIN DISKS[J]. ASTROPHYSICAL JOURNAL,2011,732(1). |
| APA | Zheng, Sheng-Ming,Yuan, Feng,Gu, Wei-Min,&Lu, Ju-Fu.(2011).REVISITING THE THERMAL STABILITY OF RADIATION-DOMINATED THIN DISKS.ASTROPHYSICAL JOURNAL,732(1). |
| MLA | Zheng, Sheng-Ming,et al."REVISITING THE THERMAL STABILITY OF RADIATION-DOMINATED THIN DISKS".ASTROPHYSICAL JOURNAL 732.1(2011). |
入库方式： OAI收割
来源：上海天文台
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