Chandra Observation of Point Sources in the X-Ray Elliptical Galaxy NGC 1407

被引:0
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作者
Zhong-Li Zhang
Hai-Guang Xu National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 Department of Physics Shanghai Jiao Tong University Shanghai 200030
机构
基金
中国国家自然科学基金;
关键词
binaries:close; galaxies:elliptical and lenticular; galaxies:individual: NGC 1407; X-rays:binaries; X-rays:galaxies;
D O I
暂无
中图分类号
P153 [双星和聚星];
学科分类号
070401 ;
摘要
With the Chandra pointing observation of about 50 ks, we have detected41 point sources in the X-ray relatively faint elliptical galaxy NGC 1407, most ofwhich appear to be low mass X-ray binaries. In luminosity flux units, these resolvedpoint sources contribute about 17.8% of the total emission of the galaxy in 0.3-10 keV. Of the remaining diffuse emission, about 53.4% (or 43.9% of total) may arisefrom unresolved point sources. We find six ultraluminous X-ray sources with lumi-nosities above 10erg s. This number is less than has been found in NGC 720,but more than in NGC 4697 and NGC 1553, so suggesting a possible correlationbetween the number of ULXs and the total X-ray luminosity of early-type galaxies.A central point-like source is detected whose luminosity (2.36±0.14×10erg s)is the highest among all resolved sources. However, because of its relatively lowhardness ratio, we speculate that it is not likely to be a low luminosity AGN.
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页码:221 / 230
页数:10
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