THE ACCRETION WIND MODEL OF FERMI BUBBLES. II. RADIATION
文献类型：期刊论文
| 作者 | Mou, Guobin1,2; Yuan, Feng1 ; Gan, Zhaoming1; Sun, Mouyuan3,4,5,6
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2015-09-20 |
| 卷号 | 811期号:1页码:1 |
| 关键词 | accretion black hole physics galaxies: active galaxies: jets Galaxy: nucleus accretion disks |
| 英文摘要 | In a previous work, we have shown that the formation of Fermi bubbles can be due to the interaction between winds launched from the hot accretion flow in Sgr A* and the interstellar medium (ISM). In that work, we focus only on the morphology. In this paper we continue our study by calculating the gamma-ray radiation. Some cosmic-ray protons (CRp) and electrons (CRe) must be contained in the winds, which are likely formed by physical processes such as magnetic reconnection. We have performed MHD simulations to study the spatial distribution of CRp, considering the advection and diffusion of CRp in the presence of magnetic field. We find that a permeated zone is formed just outside of the contact discontinuity between winds and the ISM, where the collisions between CRp and thermal nuclei mainly occur. The decay of neutral pions generated in the collisions, combined with the inverse Compton scattering of background soft photons by the secondary leptons generated in the collisions and primary CRe, can well explain the observed gamma-ray spectral energy distribution. Other features such as the uniform surface brightness along the latitude and the boundary width of the bubbles are also explained. The advantage of this "accretion wind" model is that the adopted wind properties come from the detailed small-scale MHD numerical simulation of accretion flows and the value of mass accretion rate has independent observational evidences. The success of the model suggests that we may seriously consider the possibility that cavities and bubbles observed in other contexts such as galaxy clusters may be formed by winds rather than jets. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | COSMIC-RAY DIFFUSION ; SGR A-ASTERISK ; HOT GAS HALO ; GAMMA-RAY ; BLACK-HOLE ; GALACTIC-CENTER ; SAGITTARIUS-A ; MILKY-WAY ; MULTIWAVELENGTH EMISSION ; NUMERICAL-SIMULATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000363471600038 |
| 源URL | [http://119.78.226.72/handle/331011/28383]  |
| 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, Shanghai Astron Observ, Shanghai, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA 4.Penn State Univ, Inst Gravitat & Cosmos, Davey Lab 525, University Pk, PA 16802 USA 5.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China 6.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China |
| 推荐引用方式 GB/T 7714 | Mou, Guobin,Yuan, Feng,Gan, Zhaoming,et al. THE ACCRETION WIND MODEL OF FERMI BUBBLES. II. RADIATION[J]. ASTROPHYSICAL JOURNAL,2015,811(1):1. |
| APA | Mou, Guobin,Yuan, Feng,Gan, Zhaoming,&Sun, Mouyuan.(2015).THE ACCRETION WIND MODEL OF FERMI BUBBLES. II. RADIATION.ASTROPHYSICAL JOURNAL,811(1),1. |
| MLA | Mou, Guobin,et al."THE ACCRETION WIND MODEL OF FERMI BUBBLES. II. RADIATION".ASTROPHYSICAL JOURNAL 811.1(2015):1. |
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