首页> 外文期刊>The Astrophysical journal >THE CHANDRA LOCAL VOLUME SURVEY. I. THE X-RAY POINT SOURCE POPULATIONS OF NGC 55, NGC 2403, AND NGC 4214
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THE CHANDRA LOCAL VOLUME SURVEY. I. THE X-RAY POINT SOURCE POPULATIONS OF NGC 55, NGC 2403, AND NGC 4214

机译:香德拉地方卷调查。 I.NGC 55,NGC 2403和NGC 4214的X射线点源人口

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We present comprehensive X-ray point source catalogs of NGC 55, NGC 2403, and NGC 4214 as part of the Chandra Local Volume Survey. The combined archival observations have effective exposure times of 56.5 ks, 190 ks, and 79 ks for NGC 55, NGC 2403, and NGC 4214, respectively. When combined with our published catalogs for NGC 300 and NGC 404, our survey contains 629 X-ray sources total down to a limiting unabsorbed luminosity of erg s?1 in the 0.35–8 keV band in each of the five galaxies. We present X-ray hardness ratios, spectral analysis, radial source distributions, and an analysis of the temporal variability for the X-ray sources detected at high significance. To constrain the nature of each X-ray source, we carried out cross-correlations with multi-wavelength data sets. We searched overlapping Hubble Space Telescope observations for optical counterparts to our X-ray detections to provide preliminary classifications for each X-ray source as a likely X-ray binary, background active galactic nucleus, supernova remnant, or foreground star.
机译:作为Chandra本地体积调查的一部分,我们介绍了NGC 55,NGC 2403和NGC 4214的综合X射线源源目录。对于NGC 55,NGC 2403和NGC 4214,组合的归档观测值的有效暴露时间分别为56.5 ks,190 ks和79 ks。当与我们已发布的NGC 300和NGC 404目录结合使用时,我们的调查将包含629个X射线源,其总数量一直到五个星系中每个0.35–8 keV波段的erg s?1的极限未吸收光度。我们介绍X射线硬度比,光谱分析,放射源分布,以及对X射线源的时间变异性进行分析的重要意义。为了限制每个X射线源的性质,我们对多波长数据集进行了互相关。我们搜索了重叠的哈勃太空望远镜观测资料,以寻找与我们的X射线探测相对应的光学探测器,从而为每个X射线源提供了初步分类,包括可能的X射线双星,背景活跃的银河核,超新星残余或前景星。

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