Discovery of a soft X-ray lag in the ultraluminous X-ray source NGC 1313 X-1

doi:10.1093/mnras/stz3318

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	Discovery of a soft X-ray lag in the ultraluminous X-ray source NGC 1313 X-1
	Kara, E.1; Pinto, C.2,3; Walton, D. J.4; Alston, W. N.4; Bachetti, M.5; Barret, D.6; Brightman, M.7; Canizares, C. R.1; Earnshaw, H. P.7; Fabian, A. C.4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2020-02-01
卷号	491 期号:4 页码:5172-5178
关键词	accretion, accretion discs X-rays: binaries X-rays: individual: NGC 1313 X-1
ISSN号	0035-8711
DOI	10.1093/mnras/stz3318
英文摘要	Ultraluminous X-ray sources (ULXs) provide a unique opportunity to probe the geometry and energetics of super-Eddington accretion. The radiative processes involved in super-Eddington accretion are not well understood, and so studying correlated variability between different energy bands can provide insights into the causal connection between different emitting regions. We present a spectral-timing analysis of NGC 1313 X-1 from a recent XMM-Newton campaign. The spectra can be decomposed into two thermal-like components, the hotter of which may originate from the inner accretion disc, and the cooler from an optically thick outflow. We find correlated variability between hard (2-10 keV) and soft (0.3-2 keV) bands on kilosecond time-scales, and find a soft lag of similar to 150 s. The covariance spectrum suggests that emission contributing to the lags is largely associated with the hotter of the two thermal-like components, likely originating from the inner accretion flow. This is only the third ULX to exhibit soft lags. The lags range over three orders of magnitude in amplitude, but all three are similar to 5-20 per cent of the corresponding characteristic variability time-scales. If these soft lags can be understood in the context of a unified picture of ULXs, then lag time-scales may provide constraints on the density and extent of radiatively driven outflows.
资助项目	NASA[80NSSC19K0176] ; NASA[NAS8-03060] ; ESA Research Fellowships ; STFC[ST/K000861/1] ; Smithsonian Astrophysical Observatory (SAO) contract[SV373016]
WOS关键词	TIME-LAGS ; COHERENT PULSATIONS ; BLACK-HOLES ; VARIABILITY ; EMISSION ; PULSAR ; STATE ; HARD ; ULX
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000512310600043
资助机构	NASA ; NASA ; ESA Research Fellowships ; ESA Research Fellowships ; STFC ; STFC ; Smithsonian Astrophysical Observatory (SAO) contract ; Smithsonian Astrophysical Observatory (SAO) contract ; NASA ; NASA ; ESA Research Fellowships ; ESA Research Fellowships ; STFC ; STFC ; Smithsonian Astrophysical Observatory (SAO) contract ; Smithsonian Astrophysical Observatory (SAO) contract ; NASA ; NASA ; ESA Research Fellowships ; ESA Research Fellowships ; STFC ; STFC ; Smithsonian Astrophysical Observatory (SAO) contract ; Smithsonian Astrophysical Observatory (SAO) contract ; NASA ; NASA ; ESA Research Fellowships ; ESA Research Fellowships ; STFC ; STFC ; Smithsonian Astrophysical Observatory (SAO) contract ; Smithsonian Astrophysical Observatory (SAO) contract
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/54124]
专题	中国科学院国家天文台
通讯作者	Kara, E.
作者单位	1.MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA 2.ESTEC ESA, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands 3.INAF IASF Palermo, Via U La Malfa 153, I-90146 Palermo, Italy 4.Inst Astron, Madingley Rd, Cambridge CB3 0HA, England 5.INAF Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, Italy 6.Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, 9 Ave Colonel Roche,BP 44346, F-31028 Toulouse 4, France 7.CALTECH, Cahill Ctr Astron & Astrophys, 1216 East Calif Blvd, Pasadena, CA 91125 USA 8.European Space Astron Ctr, Sci Operat Dept, E-28692 Madrid, Spain 9.Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England 10.Univ Durham, Ctr Extragalact Astron, Dept Phys, South Rd, Durham DH1 3LE, England
推荐引用方式 GB/T 7714	Kara, E.,Pinto, C.,Walton, D. J.,et al. Discovery of a soft X-ray lag in the ultraluminous X-ray source NGC 1313 X-1[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,491(4):5172-5178.
APA	Kara, E..,Pinto, C..,Walton, D. J..,Alston, W. N..,Bachetti, M..,...&Webb, N. A..(2020).Discovery of a soft X-ray lag in the ultraluminous X-ray source NGC 1313 X-1.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,491(4),5172-5178.
MLA	Kara, E.,et al."Discovery of a soft X-ray lag in the ultraluminous X-ray source NGC 1313 X-1".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 491.4(2020):5172-5178.