Hot Accretion Flow around Neutron Stars
文献类型：期刊论文
| 作者 | Bu,De-Fu2; Qiao,Erlin1,3; Yang,Xiao-Hong4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-04-24 |
| 卷号 | 875期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | accretion, accretion disks black hole physics stars: neutron X-rays: binaries |
| DOI | 10.3847/1538-4357/ab12ea |
| 英文摘要 | Abstract We perform for the first time hydrodynamic simulations to study the properties of hot accretion flow (HAF) around a neutron star (NS). The energy carried by the HAF will eventually be radiated out at the surface of the NS. The emitted photons can propagate inside the HAF and cool the HAF via Comptonization. We find that the Compton cooling can affect the properties of the HAF around an NS significantly. We define the Eddington accretion rate as , with LEdd and c being the Eddington luminosity and the speed of light, respectively. We define as the mass accretion rate at the NS surface in units of . When , Compton cooling can effectively cool the HAF and suppress wind. Therefore, the mass accretion rate is almost a constant with radius. The density profile is ρ ∝ r?1.4. When , the Compton cooling effects become weaker, wind becomes stronger, and accretion rate is proportional to r0.3–0.5. Consequently, the density profile becomes flatter, . When , the Compton cooling effects can be neglected. We find that with the same accretion rate, the temperature of the HAF around an NS is significantly lower than that of the HAF around a black hole (BH). Also, the Compton y-parameter of the HAF around an NS is significantly smaller than that of the HAF around a BH. This result predicts that the HAF around an NS will produce a softer spectrum compared to the HAF around a BH, which is consistent with observations. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-875-2-AB12EA |
| 源URL | [http://119.78.226.72/handle/331011/31817]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, People's Republic of China 2.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China; dfbu@shao.ac.cn 3.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012, People's Republic of China; qiaoel@nao.cas.cn 4.Department of Physics, Chongqing University, Chongqing, 400044, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Bu,De-Fu,Qiao,Erlin,Yang,Xiao-Hong. Hot Accretion Flow around Neutron Stars[J]. The Astrophysical Journal,2019,875(2). |
| APA | Bu,De-Fu,Qiao,Erlin,&Yang,Xiao-Hong.(2019).Hot Accretion Flow around Neutron Stars.The Astrophysical Journal,875(2). |
| MLA | Bu,De-Fu,et al."Hot Accretion Flow around Neutron Stars".The Astrophysical Journal 875.2(2019). |
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来源：上海天文台
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