THE CHANDRA DEEP FIELD-SOUTH SURVEY: 2 Ms SOURCE CATALOGS
THE CHANDRA DEEP FIELD-SOUTH SURVEY: 2 Ms SOURCE CATALOGS
复制标题
DOI：
10.1086/591248
复制
发表时间：
2008-11-01
影响因子：
8.7
通讯作者：
Vignali, C.
中科院分区：
文献类型：
--
作者：
Luo, B.;Bauer, F. E.;Vignali, C.
我们给出了钱德拉深场-南方(CDF-S)约2毫秒曝光的点源星表；这是有史以来进行的两次最敏感的X射线测量之一。对于0.5-2.0和2-8keV能带，测量面积约为436arcmin(2)，轴上灵敏度极限分别约为1：9；10(-17)和约1：3；10(-16)ergs cm(-2)S(-1)。在搜索的三个X射线波段中的至少一个波段中检测到了462个X射线点源；与之前大约1ms的CDF-S探测相比，这些点源中有135个是新的。震源位置使用质心和匹配滤波技术确定，位置不确定度中位数约为0.36‘。新探测到的源的X射线-光通量比表明了各种源类型；大约55%的源似乎是活动星系核，而大约45%的源似乎是星暴和正常星系。除了主Chandra星表外，我们还提供了一个补充星表，其中包括86个X射线源，大约2ms的CDF-S足迹，这是通过将大约250k扩展的Chandra深场-南与CDF-S合并而创建的；这种方法在CDF-S的外部提供了额外的灵敏度。第二个补充星表包含30个X射线源，通过将较低重要性的X射线源与明亮的光学对应物进行匹配而构建(R<；23：8)；这些源中的大多数似乎是星暴和正常星系。主目录和补充目录中的来源总数为578个。在主目录和补充目录中为X射线源提供了光学R波段对应以及基本的光学和红外测光。我们还包括了224个X射线源的现有光谱红移。在0.066-2.0keV和2Y8keV波段的平均背景数分别为0.066和0.167个毫秒(-1)像素(-1)，背景数服从泊松分布。CDF-S的有效曝光时间和灵敏度极限现在与钱德拉深场北向(CDF-N)约2ms的相当。我们还提供了主目录的累计计数，并将结果与CDF-N的结果进行了比较。当通量大于2时，两场的软带数符合得很好；10(-16)ergs cm(-2)的S(-1)，而在通量小于2时，CDF-S数比CDF-N的小约25%；软带的10(-16)ergs cm(-2)S(-1)，接近2；硬带的10(-15)ergs cm(-2)S(-1)，表明场到场的变化很小。
We present point-source catalogs for the approximate to 2Ms exposure of the Chandra Deep Field-South (CDF-S); this is one of the two most sensitive X-ray surveys ever performed. The survey covers an area of approximate to 436 arcmin(2) and reaches on-axis sensitivity limits of approximate to 1: 9; 10(-17) and approximate to 1:3; 10(-16) ergs cm(-2) s(-1) for the 0.5-2.0 and 2-8 keV bands, respectively. Four hundred and sixty-two X-ray point sources are detected in at least one of three X-ray bands that were searched; 135 of these sources are new compared to the previous approximate to 1 Ms CDF-S detections. Source positions are determined using centroid and matched-filter techniques; the median positional uncertainty is approximate to 0.36 ''. The X-ray-to-optical flux ratios of the newly detected sources indicate a variety of source types; approximate to 55% of them appear to be active galactic nuclei, while approximate to 45% appear to be starburst and normal galaxies. In addition to the main Chandra catalog, we provide a supplementary catalog of 86 X-ray sources in the approximate to 2Ms CDF-S footprint that was created by merging the approximate to 250 ks Extended Chandra Deep Field-South with the CDF-S; this approach provides additional sensitivity in the outer portions of the CDF-S. A second supplementary catalog that contains 30 X-ray sources was constructed by matching lower significance X-ray sources to bright optical counterparts (R < 23: 8); the majority of these sources appear to be starburst and normal galaxies. The total number of sources in the main and supplementary catalogs is 578. Optical R-band counterparts and basic optical and infrared photometry are provided for the X-ray sources in the main and supplementary catalogs. We also include existing spectroscopic redshifts for 224 of the X-ray sources. The average backgrounds in the 0.5-2.0 and 2Y8 keV bands are 0.066 and 0.167 counts Ms(-1) pixel(-1), respectively, and the background counts follow Poisson distributions. The effective exposure times and sensitivity limits of the CDF-S are now comparable to those of the approximate to 2Ms Chandra Deep Field-North (CDF-N). We also present cumulative number counts for the main catalog and compare the results to those for the CDF-N. The soft-band number counts for these two fields agree well with each other at fluxes higher than approximate to 2; 10(-16) ergs cm(-2) s(-1), while the CDF-S number counts are up to approximate to 25% smaller than those for the CDF-N at fluxes below approximate to 2; 10(-16) ergs cm(-2) s(-1) in the soft band and approximate to 2; 10(-15) ergs cm(-2) s(-1) in the hard band, suggesting small field-to-field variations.