中国科学院机构知识库网格系统: CG X-1: An Eclipsing Wolf-Rayet ULX in the Circinus Galaxy

CG X-1: An Eclipsing Wolf-Rayet ULX in the Circinus Galaxy

文献类型：期刊论文


作者	Qiu, Yanli 1,2; Soria, Roberto 1,2,3,4; Wang, Song 1; Wiktorowicz, Grzegorz 1,2; Liu, Jifeng 1,2,5; Bai, Yu 1; Bogomazov, Alexey 6; Di Stefano, Rosanne 7; Walton, Dominic J.8; Xu, Xiaojie 9,10
刊名	ASTROPHYSICAL JOURNAL
出版日期	2019-05-20
卷号	877 期号:1 页码:24
ISSN号	0004-637X
关键词	accretion, accretion disks stars: Wolf-Rayet X-rays: binaries X-rays: individual (CGX-1)
DOI	10.3847/1538-4357/ab16e7
英文摘要	We investigated the time-variability and spectral properties of the eclipsing X-ray source Circinus Galaxy X-1 (GG X-1), using Chandra, XMM-Newton and ROSAT. We phase-connected the light curves observed over 20 yr, and we obtained a best-fitting period P = (25,970.0 +/- 0.1) s approximate to 7.2 hr, and a period derivative (P) over dot/P = (10.2 +/- 4.6) x 10(-7) yr(-1). The X-ray light curve shows asymmetric eclipses, with sharp ingresses and slow, irregular egresses. The eclipse profile and duration vary substantially from cycle to cycle. We show that the X-ray spectra are consistent with a power-law-like component, which is absorbed by neutral and ionized Compton-thin material, and by a Compton-thick, partial-covering medium, which is responsible for the irregular dips. The high X-ray/optical flux ratio rules out the possibility that CG X-1 is a foreground Cataclysmic Variable. In agreement with previous studies, we conclude that it is the first example of a compact ultraluminous X-ray source fed by a Wolf-Rayet star or stripped Helium star. Its unocculted luminosity varies between approximate to 4 x 10(39) erg s(-1) and approximate to 3 x 10(40) erg s(-1). Both the donor star and the super-Eddington compact object drive powerful outflows. We suggest that the occulting clouds are produced in the wind-wind collision region and in the bow shock in front of the compact object. Among the rare sample of Wolf-Rayet X-ray binaries, CG X-1 is an exceptional target for studies of supercritical accretion and close binary evolution; it is also a likely progenitor of gravitational wave events.
WOS关键词	XMM-NEWTON OBSERVATIONS ; BLACK-HOLE BINARY ; IC 10 X-1 ; X-RAY ; STELLAR WIND ; COLLIDING WINDS ; CYG X-3 ; CATACLYSMIC VARIABLES ; ACCRETION DISKS ; MASSIVE STARS
资助项目	National Program on Key Research and Development Project[2016YFA0400800] ; National Natural Science Foundation of China (NSFC)[NSFC-11425313/11603035/11603038] ; STFC Ernest Rutherford fellowship ; ESA Member States ; USA (NASA)
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000469011600007
资助机构	National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; STFC Ernest Rutherford fellowship ; STFC Ernest Rutherford fellowship ; ESA Member States ; ESA Member States ; USA (NASA) ; USA (NASA) ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; STFC Ernest Rutherford fellowship ; STFC Ernest Rutherford fellowship ; ESA Member States ; ESA Member States ; USA (NASA) ; USA (NASA) ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; STFC Ernest Rutherford fellowship ; STFC Ernest Rutherford fellowship ; ESA Member States ; ESA Member States ; USA (NASA) ; USA (NASA) ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; STFC Ernest Rutherford fellowship ; STFC Ernest Rutherford fellowship ; ESA Member States ; ESA Member States ; USA (NASA) ; USA (NASA)
源URL	[http://ir.bao.ac.cn/handle/114a11/26445]
专题	中国科学院国家天文台
通讯作者	Qiu, Yanli
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 3.Curtin Univ, Int Ctr Radio Astron Res, GPO Box U1987, Perth, WA 6845, Australia 4.Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia 5.Wuhan Univ, WHU NAOC Joint Ctr Astron, Wuhan 430072, Hubei, Peoples R China 6.Moscow MV Lomonosov State Univ, PK Sternberg Astron Inst, 13 Univ Skij Prospect, Moscow 119991, Russia 7.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 8.Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England 9.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China 10.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Qiu, Yanli,Soria, Roberto,Wang, Song,et al. CG X-1: An Eclipsing Wolf-Rayet ULX in the Circinus Galaxy[J]. ASTROPHYSICAL JOURNAL,2019,877(1):24.
APA	Qiu, Yanli.,Soria, Roberto.,Wang, Song.,Wiktorowicz, Grzegorz.,Liu, Jifeng.,...&Xu, Xiaojie.(2019).CG X-1: An Eclipsing Wolf-Rayet ULX in the Circinus Galaxy.ASTROPHYSICAL JOURNAL,877(1),24.
MLA	Qiu, Yanli,et al."CG X-1: An Eclipsing Wolf-Rayet ULX in the Circinus Galaxy".ASTROPHYSICAL JOURNAL 877.1(2019):24.

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CG X-1: An Eclipsing Wolf-Rayet ULX in the Circinus Galaxy

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