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Hot Accretion Flow around Neutron Stars

文献类型：期刊论文

作者Bu, De-Fu4; Qiao, Erlin2,3; Yang, Xiao-Hong1
刊名ASTROPHYSICAL JOURNAL
出版日期2019-04-20
卷号875期号:2页码:9
关键词accretion, accretion disks black hole physics stars: neutron X-rays: binaries
ISSN号0004-637X
DOI10.3847/1538-4357/ab12ea
英文摘要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 (M)over dot(Edd) = 10L(Edd) /C-2, with L-Edd and c being the Eddington luminosity and the speed of light, respectively. We define (m)over dot as the mass accretion rate at the NS surface in units of (M)over dot(Edd). When (m)over dot > 10(-4), 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 rho proportional to r(-1.4). When (m)over dot < 10(-4), the Compton cooling effects become weaker, wind becomes stronger, and accretion rate is proportional to r(0.3-0.5). Consequently, the density profile becomes flatter, rho proportional to r(-1 similar to-0.8). When (m)over dot < 10(-6), 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.
WOS关键词ADVECTION-DOMINATED ACCRETION ; SPECTRAL STATE TRANSITION ; X-RAY-SPECTRA ; BLACK-HOLE ; RADIATIVE ACCRETION ; SIMULATIONS ; HYSTERESIS ; DISKS ; INSTABILITY ; PULSATIONS
资助项目Natural Science Foundation of China[11773053] ; Natural Science Foundation of China[11573051] ; Natural Science Foundation of China[11633006] ; Natural Science Foundation of China[11661161012] ; Natural Science Foundation of China[11773037] ; Natural Science Foundation of Shanghai[16ZR1442200] ; Key Research Program of Frontier Sciences of CAS[QYZDJSSW-SYS008]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000465974900016
出版者IOP PUBLISHING LTD
资助机构Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Key Research Program of Frontier Sciences of CAS ; Key Research Program of Frontier Sciences of CAS ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Key Research Program of Frontier Sciences of CAS ; Key Research Program of Frontier Sciences of CAS ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Key Research Program of Frontier Sciences of CAS ; Key Research Program of Frontier Sciences of CAS ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Key Research Program of Frontier Sciences of CAS ; Key Research Program of Frontier Sciences of CAS
源URL[http://ir.bao.ac.cn/handle/114a11/26322]  
专题中国科学院国家天文台
通讯作者Bu, De-Fu
作者单位1.Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100012, Peoples R China
4.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R 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]. ASTROPHYSICAL JOURNAL,2019,875(2):9.
APA Bu, De-Fu,Qiao, Erlin,&Yang, Xiao-Hong.(2019).Hot Accretion Flow around Neutron Stars.ASTROPHYSICAL JOURNAL,875(2),9.
MLA Bu, De-Fu,et al."Hot Accretion Flow around Neutron Stars".ASTROPHYSICAL JOURNAL 875.2(2019):9.

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