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NUMERICAL SIMULATION OF HOT ACCRETION FLOWS. II. NATURE, ORIGIN, AND PROPERTIES OF OUTFLOWS AND THEIR POSSIBLE OBSERVATIONAL APPLICATIONS
文献类型：期刊论文
| 作者 | Yuan, Feng1,2,3 ; Bu, Defu1; Wu, Maochun1
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-12-20 |
| 卷号 | 761期号:2页码:130 |
| 关键词 | accretion black hole physics hydrodynamics accretion disks |
| 英文摘要 | Hydrodynamical (HD) and magnetohydrodynamical (MHD) numerical simulations of hot accretion flows have indicated that the inflow accretion rate decreases inward. Two models have been proposed to explain this result. In the adiabatic inflow-outflow solution (ADIOS), this is because of the loss of gas in the outflow. In the alternative convection-dominated accretion flow model, it is thought that the flow is convectively unstable and gas is locked in convective eddies. We investigate the nature of the inward decrease of the accretion rate using HD and MHD simulations. We calculate various properties of the inflow and outflow such as temperature and rotational velocity. Systematic and significant differences are found. These results suggest that the inflow and outflow are not simply convective turbulence; instead, systematic inward and outward motion (i.e., real outflow) must exist. We have also analyzed the convective stability of MHD accretion flows and found that they are stable. These results favor the ADIOS scenario. We suggest that the mechanisms of producing outflow in HD and MHD flows are the buoyancy associated with the convection and the centrifugal force associated with the angular momentum transport mediated by the magnetic field, respectively. The latter is similar to the Blandford & Payne mechanism but no large-scale open magnetic field is required. We discuss some possible observational applications, including the Fermi bubble in the Galactic center and winds in active galactic nuclei and black hole X-ray binaries. |
| 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 ; ACTIVE GALACTIC NUCLEI ; BLACK-HOLE BINARIES ; X-RAY BINARIES ; RELATIVISTIC MAGNETOHYDRODYNAMIC SIMULATIONS ; MAGNETICALLY DRIVEN ACCRETION ; 2 SPACE DIMENSIONS ; SGR A-ASTERISK ; SEYFERT-GALAXIES ; GRO J1655-40 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000312090300049 |
| 公开日期 | 2015-01-27 |
| 源URL | [http://119.78.226.72//handle/331011/15438]  |
| 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, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China 3.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yuan, Feng,Bu, Defu,Wu, Maochun. NUMERICAL SIMULATION OF HOT ACCRETION FLOWS. II. NATURE, ORIGIN, AND PROPERTIES OF OUTFLOWS AND THEIR POSSIBLE OBSERVATIONAL APPLICATIONS[J]. ASTROPHYSICAL JOURNAL,2012,761(2):130. |
| APA | Yuan, Feng,Bu, Defu,&Wu, Maochun.(2012).NUMERICAL SIMULATION OF HOT ACCRETION FLOWS. II. NATURE, ORIGIN, AND PROPERTIES OF OUTFLOWS AND THEIR POSSIBLE OBSERVATIONAL APPLICATIONS.ASTROPHYSICAL JOURNAL,761(2),130. |
| MLA | Yuan, Feng,et al."NUMERICAL SIMULATION OF HOT ACCRETION FLOWS. II. NATURE, ORIGIN, AND PROPERTIES OF OUTFLOWS AND THEIR POSSIBLE OBSERVATIONAL APPLICATIONS".ASTROPHYSICAL JOURNAL 761.2(2012):130. |
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来源：上海天文台
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