Hot one-temperature accretion flows revisited
文献类型：期刊论文
| 作者 | Yuan, F ; Taam, RE; Xue, YQ; Cui, W
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| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2006 |
| 卷号 | 636期号:1页码:46-55 |
| 关键词 | accretion black hole physics galaxies : active Galaxy : center hydrodynamics stars : individual (XTE J1118+480) accretion disks |
| 英文摘要 | The effectiveness of the thermal coupling of ions and electrons in optically thin, hot accretion flows is investigated in a phenomenological approach. In the limit of complete coupling, we focus on the one-temperature accretion flows around black holes. Based on a global analysis, the results are compared with two-temperature accretion flow models and with the observations of black hole sources. Many features of one-and two-temperature solutions are quite similar. That is, hot one-temperature solutions are found to exist for mass flow rates less than a critical value, i.e.,. M less than or similar to 10 alpha(2)M(Edd), where M-Edd = L-Edd/c(2) is the Eddington accretion rate. When. M less than or similar to 10(-3)alpha(2)M(Edd), the viscous energy is mainly balanced by the advective cooling, i.e., the solution is in the advection-dominated accretion flow ( ADAF) regime. On the other hand, when 10(-3)alpha(2)M(Edd) less than or similar to M less than or similar to 10 alpha(2)M(Edd), radiative cooling is effective and is mainly balanced by advective heating, placing the solution in the regime of luminous hot accretion flow ( LHAF). When. M greater than or similar to 10 alpha(2)M(Edd), the accretion flow collapses at a transition radius with only the standard optically thick and geometrically thin disk solution existing in the innermost regions. We have fitted the spectra of the two black hole sources with the one-temperature models, Sgr A* and XTE J1118+ 480, which have been examined successfully with two-temperature models. It is found that the one-temperature models do not provide acceptable fits to the multi-wavelength spectra of Sgr A* nor to XTE J1118+ 480 as a result of the higher temperatures characteristic of the one-temperature models. It is concluded that the thermal coupling of ions and electrons cannot be fully effective and that a two-temperature description is required. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | 星系和宇宙学研究中心 |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ADVECTION-DOMINATED ACCRETION ; BLACK-HOLE BINARIES ; XTE J1118+480 ; DISKS ; TRANSITION ; ELECTRONS ; BEHAVIOR ; BEPPOSAX ; ORIGIN |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000234288800005 |
| 公开日期 | 2010-11-08 |
| 源URL | [http://119.78.226.72//handle/331011/12631]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Northwestern Univ, Dept Phys & Astron, Dearborn Observ, Evanston, IL 60208 USA 4.Natl Tsing Hua Univ, Acad Sinica, Inst Astron & Astrophys, Theoret Inst Adv Res Astrophys, Hsinchu, Taiwan |
| 推荐引用方式 GB/T 7714 | Yuan, F,Taam, RE,Xue, YQ,et al. Hot one-temperature accretion flows revisited[J]. ASTROPHYSICAL JOURNAL,2006,636(1):46-55. |
| APA | Yuan, F,Taam, RE,Xue, YQ,&Cui, W.(2006).Hot one-temperature accretion flows revisited.ASTROPHYSICAL JOURNAL,636(1),46-55. |
| MLA | Yuan, F,et al."Hot one-temperature accretion flows revisited".ASTROPHYSICAL JOURNAL 636.1(2006):46-55. |
入库方式： OAI收割
来源：上海天文台
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