Our supermassive black hole rivaled the Sun in the ancient X-ray sky

doi:10.1088/1475-7516/2019/12/056

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	Our supermassive black hole rivaled the Sun in the ancient X-ray sky
	Amaro-Seoane, Pau 1,2,3,4; Chen, Xian 1,2
	2019-12-01
发表期刊	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
ISSN	1475-7516
期号	12 页码:10
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.
关键词	X-rays active galactic nuclei accretion massive black holes
DOI	10.1088/1475-7516/2019/12/056
收录类别	SCI
语种	英语
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
WOS类目	Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号	WOS:000507261900053
出版者	IOP PUBLISHING LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/50538
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.Chinese Acad Sci, Acad Math & Syst Sci, Inst Appl Math, Beijing 100190, Peoples R China 4.TU Berlin, Zentrum Astron & Astrophys, Hardenbergstr 36, D-10623 Berlin, Germany
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.