Identification of X-ray point sources and a study of the nature of 62 X-ray globular cluster candidates in M31

	Identification of X-ray point sources and a study of the nature of 62 X-ray globular cluster candidates in M31
	Fan, Z; Wu, ZY; Jiang, ZJ; Chen, JS; Zhou, X; Ma, J
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
	2005-11-01
卷号	117 期号:837 页码:1236-1249
英文摘要	This paper includes two parts. The first presents the spectral energy distributions (SEDs) of 49 globular cluster (GC) X-ray sources in 13 BATC (Beijing-Arizona-Taiwan-Connecticut) intermediate-band filters from 3800 to 10000 A, and identifies 8 previously unidentified X-ray sources in M31. Using X-ray data from Einstein observations from 1979 to 1980, ROSAT High Resolution Imager observations in 1990, Chandra High Resolution Channel and ACIS-I observations from 1999 to 2001, and the BATC optical survey from 1995 to 1999, we find 49 GC X-ray sources and 8 new X-ray sources in the BATC M31 field. By analyzing SEDs and FWHMs, we determine that 4 of the 8 X-ray sources may be GC candidates. The second part presents some statistical relationships between 62 GC X-ray sources, of which 58 are already known and 4 are identified in this paper. The distribution of M31' s GC X-ray sources' V magnitudes is bimodal, with peaks at m(v) = 15.65 and 17.89, which is different from the distribution of GC candidates. The distribution B - V of color shows that the GC X-ray sources seem to be associated preferentially with the redder GCs, in agreement with previous results. Kolmogorov- Smirnov test shows that the maximum value of the absolute difference of B - V distributions of GC X-ray sources and GCs is D-max = 0.181, and the probability P = 0.068, which means we can reject the hypothesis that the two distributions are the same at the 90.0% confidence level. Finally, we study the correlation between X-ray luminosity (0.3 - 10 keV) and optical luminosity ( in the V band) of the GC X-ray sources in M31, and find that there exits a weak relationship with the linear correlation coefficient r = 0.36 at a confidence level of 98.0%.
语种	英语
WOS记录号	WOS:000232881400007
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8930]
专题	国家天文台_光学天文研究部
作者单位	Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Fan, Z,Wu, ZY,Jiang, ZJ,et al. Identification of X-ray point sources and a study of the nature of 62 X-ray globular cluster candidates in M31[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2005,117(837):1236-1249.
APA	Fan, Z,Wu, ZY,Jiang, ZJ,Chen, JS,Zhou, X,&Ma, J.(2005).Identification of X-ray point sources and a study of the nature of 62 X-ray globular cluster candidates in M31.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,117(837),1236-1249.
MLA	Fan, Z,et al."Identification of X-ray point sources and a study of the nature of 62 X-ray globular cluster candidates in M31".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 117.837(2005):1236-1249.