Radiation-driven outflow in active galactic nuclei: the feedback effects of scattered and reprocessed photons
文献类型:期刊论文
作者 | Liu, Chao1,2; Yuan, Feng1![]() |
刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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出版日期 | 2013-09-01 |
卷号 | 434期号:2页码:1721-1735 |
关键词 | accretion hydrodynamics methods: numerical galaxies: active galaxies: nuclei accretion discs |
英文摘要 | We perform time-dependent, two-dimensional, hydrodynamical, numerical simulations to study the dynamics of a slowly rotating accretion flow from sub-pc to pc scales under the irradiation from the central active galactic nucleus (AGN). Compared to previous work, we improve the calculation of the radiative force due to X-rays. More importantly, in addition to radiative pressure and radiative heating/cooling directly from the central AGN, in the momentum equation we also include the force due to the scattered and reprocessed photons. We find that the accretion flow properties change significantly due to this 're-radiation' effect. The inflow rate at the inner boundary is reduced, while the outflow rate at the outer boundary is enhanced by about one order of magnitude. This effect is more significant when the density at the outer boundary is higher. The properties of outflows such as velocity, momentum and energy fluxes, and the ratio of outflow rate and the accretion rate are calculated. We find that the efficiency of transferring the radiation power into the kinetic power of outflow is typically 10(-3), far below the value of similar to 0.05 which is assumed in some cosmological simulations. The effect of the temperature of the gas at the outer boundary (T-0) is investigated. When T-0 is high, the emitted luminosity of the accretion flow oscillates. This is because in this case the gas around the Bondi radius can be more easily heated to be above the virial temperature due to its high internal energy. Another question we hope to address by this work is the so-called sub-Eddington puzzle. That is, observations show that the luminosity of almost all AGNs are sub-Eddington, while theoretically the luminosity of an accretion flow can easily be super-Eddington. We find that even when the re-radiation effect is included and outflow does become much stronger, the luminosity, while reduced, can still be super-Eddington. Other observational implications and some caveats of our calculations are discussed. |
WOS标题词 | Science & Technology ; Physical Sciences |
类目[WOS] | Astronomy & Astrophysics |
研究领域[WOS] | Astronomy & Astrophysics |
关键词[WOS] | SUPERMASSIVE BLACK-HOLES ; SUPERCRITICAL ACCRETION FLOWS ; RADIO-QUIET AGNS ; ELLIPTIC GALAXIES ; DISK WINDS ; QUASAR OUTFLOW ; MAGNETOHYDRODYNAMIC SIMULATIONS ; NUMERICAL-SIMULATION ; COOLING FLOWS ; HOST GALAXIES |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000323638200063 |
公开日期 | 2014-09-22 |
源URL | [http://119.78.226.72//handle/331011/15137] ![]() |
专题 | 上海天文台_空间导航与定位技术重点实验室 |
作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA 4.Columbia Univ, Dept Astron, Nyc, NY 10027 USA 5.Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China |
推荐引用方式 GB/T 7714 | Liu, Chao,Yuan, Feng,Ostriker, Jeremiah P.,et al. Radiation-driven outflow in active galactic nuclei: the feedback effects of scattered and reprocessed photons[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,434(2):1721-1735. |
APA | Liu, Chao,Yuan, Feng,Ostriker, Jeremiah P.,Gan, Zhaoming,&Yang, Xiaohong.(2013).Radiation-driven outflow in active galactic nuclei: the feedback effects of scattered and reprocessed photons.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,434(2),1721-1735. |
MLA | Liu, Chao,et al."Radiation-driven outflow in active galactic nuclei: the feedback effects of scattered and reprocessed photons".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 434.2(2013):1721-1735. |
入库方式: OAI收割
来源:上海天文台
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