Our supermassive black hole rivaled the Sun in the ancient X-ray sky
文献类型：期刊论文
| 作者 | Amaro-Seoane, Pau1,2,3,4; Chen, Xian1,2 |
| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
 |
| 出版日期 | 2019-12-01 |
| 期号 | 12页码:10 |
| 关键词 | X-rays active galactic nuclei accretion massive black holes |
| ISSN号 | 1475-7516 |
| DOI | 10.1088/1475-7516/2019/12/056 |
| 英文摘要 | Sagittarius A* (SgrA*) lying in the Galactic Centre 8 kpc from Earth, hosts the closest supermassive black hole known to us. It is now inactive, but there is evidence indicating that about six million years ago it underwent a powerful outburst where the luminosity could have approached the Eddington limit. Motivated by the fact that in extragalaxies the supermassive black holes with similar masses and near-Eddington luminosities are usually strong X-ray emitters, we calculate here the X-ray luminosity of SgrA*. For that, we assume that the outburst was due to accretion of gas or the tidal disruption of a star. We show that these cases could precipitate on Earth a hard X-ray (i.e. h nu > 2 keV) flux comparable to that from the current quiescent sun. The flux in harder energy band 20 keV < h nu < 100 keV, however, surpasses that from an X-class solar flare, and the irradiation timescale is also much longer, ranging from weeks to 10(5) years depending on the outburst scenario. In the solar system gas giants will suffer the biggest impact in their atmospheres. Lower-mass planets such as Earth receive a level of radiation that might have played a role in the evolution of their primitive atmospheres, so that a detailed study of the consequences deserves further investigation. Planetary systems closer to SgrA* receive higher irradiance levels, making them more likely uninhabitable. |
| 资助项目 | National Key R&D Program of China[2016YFA0400702] ; National Science Foundation of China[11721303] ; Ramon y Cajal Programme of the Ministry of Economy, Industry and Competitiveness of Spain ; COST Action GWverse[CA16104] |
| WOS研究方向 | Astronomy & Astrophysics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000507261900053 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://ir.amss.ac.cn/handle/2S8OKBNM/50537]  |
| 专题 | 中国科学院数学与系统科学研究院 |
| 通讯作者 | Amaro-Seoane, Pau |
| 作者单位 | 1.CSIC, IEEC, Inst Ciencies Espai, Campus UAB,Carrer Can Magrans S-N, Barcelona 08193, Spain 2.Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 3.TU Berlin, Zentrum Astron & Astrophys, Hardenbergstr 36, D-10623 Berlin, Germany 4.Chinese Acad Sci, Acad Math & Syst Sci, Inst Appl Math, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Amaro-Seoane, Pau,Chen, Xian. Our supermassive black hole rivaled the Sun in the ancient X-ray sky[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2019(12):10. |
| APA | Amaro-Seoane, Pau,&Chen, Xian.(2019).Our supermassive black hole rivaled the Sun in the ancient X-ray sky.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(12),10. |
| MLA | Amaro-Seoane, Pau,et al."Our supermassive black hole rivaled the Sun in the ancient X-ray sky".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .12(2019):10. |
入库方式： OAI收割
来源：数学与系统科学研究院
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