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Discovery of two eclipsing X-ray binaries in M51

文献类型：期刊论文

作者Wang, Song3; Soria, Roberto1,2,4; Urquhart, Ryan2; Liu, Jifeng1,3
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2018-07-01
卷号477期号:3页码:3623-3645
关键词stars: neutron galaxies: individual: M51 X-rays: binaries
ISSN号0035-8711
DOI10.1093/mnras/sty872
英文摘要We discovered eclipses and dips in two luminous (and highly variable) X-ray sources in M51. One (CXOM51 J132943.3+471135) is an ultraluminous supersoft source, with a thermal spectrum at a temperature of about 0.1 keV and characteristic blackbody radius of about 104 km. The other (CXOM51 J132946.1+471042) has a two-component spectrum with additional thermal-plasma emission; it approached an X-ray luminosity of 10(39) erg s(-1) during outbursts in 2005 and 2012. From the timing of three eclipses in a series of Chandra observations, we determine the binary period (52.75 +/- 0.63 h) and eclipse fraction (22 +/- 0.1 per cent) of CXOM51 J132946.1+471042. We also identify a blue optical counterpart in archival Hubble Space Telescope images, consistent with a massive donor star (mass of similar to 20-35 M-circle dot). By combining the X-ray light-curve parameters with the optical constraints on the donor star, we showthat the mass ratio in the system must be M-2/M-1 greater than or similar to 18 and therefore the compact object is most likely a neutron star (exceeding its Eddington limit in outburst). The general significance of our result is that we illustrate one method (applicable to high-inclination sources) of identifying luminous neutron star X-ray binaries, in the absence of X-ray pulsations or phase-resolved optical spectroscopy. Finally, we discuss the different X-ray spectral appearance expected from super-Eddington neutron stars and black holes at high viewing angles.
WOS关键词SUPER-EDDINGTON ACCRETION ; MASS BLACK-HOLES ; LENS-THIRRING PRECESSION ; OPTICALLY THICK OUTFLOW ; NGC 7793 P13 ; EXTERNAL GALAXIES ; NEUTRON-STARS ; ULTRALUMINOUS STATE ; SOURCE POPULATION ; NEARBY GALAXIES
资助项目ESA Member States ; Association of Universities for Research in Astronomy, Inc., under NASA[NAS 5-26555] ; National Science Foundation of China (NSFC)[11273028] ; National Science Foundation of China (NSFC)[11333004] ; National Science Foundation of China (NSFC)[11603035] ; National Astronomical Observatories, Chinese Academy of Sciences, under the Young Researcher Grant ; Curtin University Senior Research Fellowship ; Australian Government Research Training Program (RTP) Scholarship ; state government of Western Australia ; NASA
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000433893700057
出版者OXFORD UNIV PRESS
资助机构ESA Member States ; ESA Member States ; Association of Universities for Research in Astronomy, Inc., under NASA ; Association of Universities for Research in Astronomy, Inc., under NASA ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Astronomical Observatories, Chinese Academy of Sciences, under the Young Researcher Grant ; National Astronomical Observatories, Chinese Academy of Sciences, under the Young Researcher Grant ; Curtin University Senior Research Fellowship ; Curtin University Senior Research Fellowship ; Australian Government Research Training Program (RTP) Scholarship ; Australian Government Research Training Program (RTP) Scholarship ; state government of Western Australia ; state government of Western Australia ; NASA ; NASA ; ESA Member States ; ESA Member States ; Association of Universities for Research in Astronomy, Inc., under NASA ; Association of Universities for Research in Astronomy, Inc., under NASA ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Astronomical Observatories, Chinese Academy of Sciences, under the Young Researcher Grant ; National Astronomical Observatories, Chinese Academy of Sciences, under the Young Researcher Grant ; Curtin University Senior Research Fellowship ; Curtin University Senior Research Fellowship ; Australian Government Research Training Program (RTP) Scholarship ; Australian Government Research Training Program (RTP) Scholarship ; state government of Western Australia ; state government of Western Australia ; NASA ; NASA ; ESA Member States ; ESA Member States ; Association of Universities for Research in Astronomy, Inc., under NASA ; Association of Universities for Research in Astronomy, Inc., under NASA ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Astronomical Observatories, Chinese Academy of Sciences, under the Young Researcher Grant ; National Astronomical Observatories, Chinese Academy of Sciences, under the Young Researcher Grant ; Curtin University Senior Research Fellowship ; Curtin University Senior Research Fellowship ; Australian Government Research Training Program (RTP) Scholarship ; Australian Government Research Training Program (RTP) Scholarship ; state government of Western Australia ; state government of Western Australia ; NASA ; NASA ; ESA Member States ; ESA Member States ; Association of Universities for Research in Astronomy, Inc., under NASA ; Association of Universities for Research in Astronomy, Inc., under NASA ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Astronomical Observatories, Chinese Academy of Sciences, under the Young Researcher Grant ; National Astronomical Observatories, Chinese Academy of Sciences, under the Young Researcher Grant ; Curtin University Senior Research Fellowship ; Curtin University Senior Research Fellowship ; Australian Government Research Training Program (RTP) Scholarship ; Australian Government Research Training Program (RTP) Scholarship ; state government of Western Australia ; state government of Western Australia ; NASA ; NASA
源URL[http://ir.bao.ac.cn/handle/114a11/21657]  
专题中国科学院国家天文台
通讯作者Wang, Song; Soria, Roberto; Liu, Jifeng
作者单位1.Univ Chinese Acad Sci, Coll Astron & Space Sci, Beijing 100049, Peoples R China
2.Curtin Univ, Int Ctr Radio Astron Res, GPO Box U1987, Perth, WA 6845, Australia
3.Chinese Acad Sci, Natl Astron Observat, Key Lab Opt Astron, Beijing 100012, Peoples R China
4.Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia
推荐引用方式
GB/T 7714		 Wang, Song,Soria, Roberto,Urquhart, Ryan,et al. Discovery of two eclipsing X-ray binaries in M51[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,477(3):3623-3645.
APA Wang, Song,Soria, Roberto,Urquhart, Ryan,&Liu, Jifeng.(2018).Discovery of two eclipsing X-ray binaries in M51.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,477(3),3623-3645.
MLA Wang, Song,et al."Discovery of two eclipsing X-ray binaries in M51".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 477.3(2018):3623-3645.

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