A model for the radio/X-ray correlation in three neutron star low-mass X-ray binaries 4U 1728-34, Aql X-lad, and EXO 1745-248

doi:10.1093/mnras/stz1365

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	A model for the radio/X-ray correlation in three neutron star low-mass X-ray binaries 4U 1728-34, Aql X-lad, and EXO 1745-248
	Qiao, Erlin 1,2; Liu, B. F.1,2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-08-01
卷号	487 期号:2 页码:1626-1633
关键词	accretion, accretion discs black hole physics stars: neutron radio continuum: stars X-rays: binaries
ISSN号	0035-8711
DOI	10.1093/mnras/stz1365
英文摘要	Observationally, for neutron star low-mass X-ray binaries, so far, the correlation between the radio luminosity L-R and the X-ray luminosity L-X, i.e. L-R proportional to L-X(beta), has been reasonably well-established only in three sources 411 1728-34, Aql X-1, and EXO 1745-248 in their hard state. The slope beta of the radio/X-ray correlation of the three sources is different, i.e. beta similar to 1.4 for 411 1728-34, beta similar to 0.4 for Aql X-1, and beta similar to 1.6 for EXO 1745-248. In this paper, for the first time we explain the different radio/X-ray correlation of 4U 1728-34, Aql X-1, and EXO 1745-248 with the coupled advection-dominated accretion flow (ADAF)-jet model, respectively. We calculate the emergent spectrum of the ADAF-jet model for L-X and L-R at different (m) over dot = /(M) over dot/(M) over dotE(dd)), adjusting eta (eta (M) over dot(jet)/(M) over dot, describing the fraction of the accreted matter in the ADAF transferred vertically forming the jet) to fit the observed radio/X-ray correlations. Then, we derive a fitting formula of eta as a function of (m) over dot for 4U 1728-34, Aql X-1, and EXO 1745-248, respectively. If the relation between eta and (m) over dot can be extrapolated down to a lower value of (m) over dot, we find that in a wide range of (m) over dot, the value of eta in Aql X-1 is greater than that of in 41J 1728-34 and EXO 1745-248, implying that Aql X-1 may have a relatively stronger large-scale magnetic field, which is supported by the discovery of the coherent millisecond X-ray pulsation in Aql X-1.
资助项目	National Natural Science Foundation of China[11773037] ; National Natural Science Foundation of China[11673026] ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences[XDA15052100] ; National Program on Key Research and Development Project[2016YFA0400804] ; gravitational wave pilot B[XDB23040100]
WOS关键词	ADVECTION-DOMINATED ACCRETION ; BLACK-HOLES ; FLUX CORRELATION ; LOW/HARD STATE ; HARD STATES ; JET POWER ; EMISSION ; FLOWS ; BURSTS ; ENERGY
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000474919700009
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26960]
专题	中国科学院国家天文台
通讯作者	Qiao, Erlin
作者单位	1.Chinese Acad Sci, Key Lab Space Astron & Technol, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Qiao, Erlin,Liu, B. F.. A model for the radio/X-ray correlation in three neutron star low-mass X-ray binaries 4U 1728-34, Aql X-lad, and EXO 1745-248[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,487(2):1626-1633.
APA	Qiao, Erlin,&Liu, B. F..(2019).A model for the radio/X-ray correlation in three neutron star low-mass X-ray binaries 4U 1728-34, Aql X-lad, and EXO 1745-248.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,487(2),1626-1633.
MLA	Qiao, Erlin,et al."A model for the radio/X-ray correlation in three neutron star low-mass X-ray binaries 4U 1728-34, Aql X-lad, and EXO 1745-248".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 487.2(2019):1626-1633.