Spectral energy distribution of the inner accretion flow around Sgr A* - clue for a weak outflow in the innermost region
文献类型：期刊论文
| 作者 | Ma, Ren-Yi1,4,5,6; Roberts, Shawn R.3,5; Li, Ya-Ping2,4; Wang, Q. Daniel5 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2019-03-01 |
| 卷号 | 483期号:4页码:5614-5622 |
| 关键词 | accretion, accretion discs Galaxy: centre |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/sty3039 |
| 英文摘要 | Sgr A* represents a unique laboratory for the detailed study of accretion processes around a low-luminosity supermassive black hole (SMBH). Recent X-ray observations have allowed for spatially resolved modelling of the emission from the accretion flow around the SMBH, placing tight constraints on the flux and spectral shape of the accretion from the inner region with r < 10(3)R(g), where R-g = GM(BH)/C-2 is the gravitational radius of the black hole of mass M-BH. We present here the first modelling of the multiband spectral energy distribution (SED) of this inner region to better constrain the physical condition of the innermost accretion flow. Our modelling uses the Markov chain Monte Carlo method to fit the SED, accounting for the limitations on the accretion rate at the outer radius of 10(3)R(g) from the earlier works and the domination of the accretion flow within 30 R-g to the sub-mm bump. It is found that the fitting results of the outflow index could be very different. If only the most luminous part of the SED, the sub-mm bump, is considered, the outflow index is about 0, while if low-frequency radio data and X-ray data are also included, the outflow index could be 0.37 or even higher. The great difference of the fitting results indicates that the outflow index should be variable along radius, with a strong outflow in the outer region and a weak outflow in the innermost region. Such a weak outflow agrees with numerical simulations and makes it possible to explain the multiband SED even better. |
| 资助项目 | National Natural Science Foundation of China[11703064] ; Fundamental Research Funds for the Central University[20720150024] ; Natural Science Foundation of Fujian Province of China[2018J01007] ; Shanghai Sailing Program[17YF1422600] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000462281900097 |
| 出版者 | OXFORD UNIV PRESS |
| 源URL | [http://119.78.226.72/handle/331011/31837]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Ma, Ren-Yi; Roberts, Shawn R.; Li, Ya-Ping |
| 作者单位 | 1.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 3.Emprata LLC, Clifton, VA 20124 USA 4.SHAO XMU Joint Ctr Astrophys, Xiamen 361005, Fujian, Peoples R China 5.Univ Massachusetts, Dept Astron, Amherst, MA 01002 USA 6.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, Ren-Yi,Roberts, Shawn R.,Li, Ya-Ping,et al. Spectral energy distribution of the inner accretion flow around Sgr A* - clue for a weak outflow in the innermost region[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,483(4):5614-5622. |
| APA | Ma, Ren-Yi,Roberts, Shawn R.,Li, Ya-Ping,&Wang, Q. Daniel.(2019).Spectral energy distribution of the inner accretion flow around Sgr A* - clue for a weak outflow in the innermost region.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,483(4),5614-5622. |
| MLA | Ma, Ren-Yi,et al."Spectral energy distribution of the inner accretion flow around Sgr A* - clue for a weak outflow in the innermost region".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 483.4(2019):5614-5622. |
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来源：上海天文台
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