SPECTROSCOPIC STUDIES OF AN ULTRALUMINOUS SUPERSOFT X-RAY SOURCE IN M81

	SPECTROSCOPIC STUDIES OF AN ULTRALUMINOUS SUPERSOFT X-RAY SOURCE IN M81
	Bai, Yu; Liu, JiFeng; Wang, Song
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2015-04-01
卷号	802 期号:2
关键词	galaxies: individual (M81) X-rays: binaries
英文摘要	Ultraluminous supersoft X-ray sources (ULSs) exhibit supersoft X-ray spectra with blackbody temperatures below 0.1 keV and bolometric luminosities above 10(39) ergs s(-1). In this Letter, we report the first optical spectroscopic observations of a ULS in M81 using the LRIS spectrograph on the Keck I telescope. The detected Balmer emission lines show a mean intrinsic velocity dispersion of 400 +/- 80 km s(-1), which is consistent with that from an accretion disk. The spectral index of the continuum on the blue side is also consistent with the multi-color disk model. The H-alpha emission line exhibits a velocity of similar to 180 km s(-1) relative to the local stellar environment, suggesting that this ULS may be a halo system in M81 belonging to an old population. No significant shift is found for the H-alpha emission line between two observations separated by four nights.
收录类别	SCI
语种	英语
WOS记录号	WOS:000352138300014
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5754]
专题	国家天文台_光学天文研究部
作者单位	Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Bai, Yu,Liu, JiFeng,Wang, Song. SPECTROSCOPIC STUDIES OF AN ULTRALUMINOUS SUPERSOFT X-RAY SOURCE IN M81[J]. ASTROPHYSICAL JOURNAL LETTERS,2015,802(2).
APA	Bai, Yu,Liu, JiFeng,&Wang, Song.(2015).SPECTROSCOPIC STUDIES OF AN ULTRALUMINOUS SUPERSOFT X-RAY SOURCE IN M81.ASTROPHYSICAL JOURNAL LETTERS,802(2).
MLA	Bai, Yu,et al."SPECTROSCOPIC STUDIES OF AN ULTRALUMINOUS SUPERSOFT X-RAY SOURCE IN M81".ASTROPHYSICAL JOURNAL LETTERS 802.2(2015).