General relativistic model of hot accretion flows with global Compton cooling
文献类型：期刊论文
| 作者 | Niedzwiecki, Andrzej1; Xie, Fu-Guo2,3; Zdziarski, Andrzej A.4 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2012-02-01 |
| 卷号 | 420期号:2页码:1195-1206 |
| 关键词 | accretion black hole physics X-rays: binaries X-rays: general accretion discs |
| 英文摘要 | We present a model of optically thin, two-temperature accretion flows using an exact Monte Carlo treatment of global Comptonization, with seed photons from synchrotron and bremsstrahlung emission, as well as with a fully general relativistic description of both the radiative and hydrodynamic processes. We consider accretion rates for which the luminosities of the flows are between similar to 10(-3) and 10(-2) of the Eddington luminosity. The black hole spin parameter strongly affects the flow structure within the innermost similar or equal to 10 gravitational radii. The resulting large difference between the Coulomb heating in models with a non-rotating and a rapidly rotating black hole is, however, outweighed by a strong contribution of compression work, much less dependent on spin. The consequent reduction of effects related to the value of the black spin is more significant at smaller accretion rates. For a non-rotating black hole, the compressive heating of electrons dominates over their Coulomb heating, and results in an approximately constant radiative efficiency of approximate to 0.4 per cent in the considered range of luminosities. For a rapidly rotating black hole, the Coulomb heating dominates, the radiative efficiency is similar or equal to 1 per cent and it slightly increases (but less significantly than estimated in some previous works) with increasing accretion rate. Our study neglects the direct heating of electrons, which effect can lead to larger differences between the radiative properties of models with a non-rotating and a rapidly rotating black hole than estimated here. Flows with the considered parameters produce rather hard spectra, with the photon spectral index Gamma similar to 1.6, and with high-energy cut-offs at several hundred keV. We find an agreement between our model, in which the synchrotron emission is the main source of seed photons, and observations of black hole binaries in their hard states and active galactic nuclei (AGNs) at low luminosities. In particular, our model predicts a hardening of the X-ray spectrum with increasing luminosity, as indeed observed below similar to 0.01L(E) or so in both black hole binaries and AGNs. Also, our model approximately reproduces the luminosity and the slope of the X-ray emission in Cen A. |
| 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 ; X-RAY BINARIES ; SUPERMASSIVE BLACK-HOLES ; ACTIVE GALACTIC NUCLEI ; OPTICALLY THIN ; CENTAURUS-A ; RADIO GALAXIES ; FUNDAMENTAL PLANE ; SPECTRAL STATES ; XTE J1118+480 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000299417600021 |
| 源URL | [http://119.78.226.72/handle/331011/18073]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Lodz, Dept Astrophys, PL-90236 Lodz, Poland 2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 4.Ctr Astron M Kopernika, PL-00716 Warsaw, Poland |
| 推荐引用方式 GB/T 7714 | Niedzwiecki, Andrzej,Xie, Fu-Guo,Zdziarski, Andrzej A.. General relativistic model of hot accretion flows with global Compton cooling[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,420(2):1195-1206. |
| APA | Niedzwiecki, Andrzej,Xie, Fu-Guo,&Zdziarski, Andrzej A..(2012).General relativistic model of hot accretion flows with global Compton cooling.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,420(2),1195-1206. |
| MLA | Niedzwiecki, Andrzej,et al."General relativistic model of hot accretion flows with global Compton cooling".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 420.2(2012):1195-1206. |
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