Monte Carlo simulations of global Compton cooling in inner regions of hot accretion flows
文献类型：期刊论文
| 作者 | Xie, Fu-Guo1,2; Niedzwiecki, Andrzej3; Zdziarski, Andrzej A.4; Yuan, Feng1
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2010-03-21 |
| 卷号 | 403期号:1页码:170-178 |
| 关键词 | accretion accretion discs black hole physics X-rays: binaries X-rays: general |
| 英文摘要 | Hot accretion flows such as advection-dominated accretion flows are generally optically thin in the radial direction. Thus, photons generated at some radii can cool or heat electrons at other radii via Compton scattering. Such global Compton scattering has previously been shown to be important for the dynamics of accretion flows. Here, we extend previous treatments of this problem by using accurate global general relativistic Monte Carlo simulations. We focus on an inner region of the accretion flow (R < 600R(g)), for which we obtain a global self-consistent solution. As compared to the initial, not self-consistent solution, the final solution has both the cooling rate and the electron temperature significantly reduced at radii of greater than or similar to 10R(g). On the other hand, the radiation spectrum of the self-consistent solution has a shape similar to that of the initial iteration, except for the high-energy cut-off being at an energy lower by a factor of similar to 2 and the bolometric luminosity decreased by a factor of similar to 2. We also compare the global Compton scattering model with local models in spherical and slab geometries. We find that the slab model approximates the global model significantly better than the spherical one. Still, neither local model gives a good approximation to the radial profile of the cooling rate, and the differences can be up to two orders of magnitude. The local slab model underestimates the cooling rate at outer regions whereas it overestimates that rate at inner regions. We compare our modelling results to observed hard-state spectra of black hole binaries and find an overall good agreement provided any disc outflow is weak. We find that general relativistic effects in flows whose dynamics is modified by global Comptonization is crucial in approaching this agreement. |
| 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 ; BLACK-HOLE BINARIES ; SAGITTARIUS-A-ASTERISK ; CONVERGING FLUID-FLOW ; SELF-SIMILAR SOLUTION ; X-RAY BINARIES ; SPECTRAL STATES ; BULK MOTION ; HARD ; DISKS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000276351600031 |
| 公开日期 | 2011-06-29 |
| 源URL | [http://119.78.226.72//handle/331011/13367]  |
| 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.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 3.Univ Lodz, Dept Astrophys, PL-90236 Lodz, Poland 4.Ctr Astronomiczne M Kopernika, PL-00716 Warsaw, Poland |
| 推荐引用方式 GB/T 7714 | Xie, Fu-Guo,Niedzwiecki, Andrzej,Zdziarski, Andrzej A.,et al. Monte Carlo simulations of global Compton cooling in inner regions of hot accretion flows[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,403(1):170-178. |
| APA | Xie, Fu-Guo,Niedzwiecki, Andrzej,Zdziarski, Andrzej A.,&Yuan, Feng.(2010).Monte Carlo simulations of global Compton cooling in inner regions of hot accretion flows.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,403(1),170-178. |
| MLA | Xie, Fu-Guo,et al."Monte Carlo simulations of global Compton cooling in inner regions of hot accretion flows".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 403.1(2010):170-178. |
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