XBootes: An X-Ray Survey of the NDWFS Bootes Field. I. Overview and Initial Results
XBootes: An X-Ray Survey of the NDWFS Bootes Field. I. Overview and Initial Results
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XBootes：NDWFS Bootes 场的 X 射线调查。
DOI：
10.1086/444378
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Rieke
中科院分区：
文献类型：
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作者：
S. Murray;A. Kenter;W. Forman;C. Jones;P. Green;C. Kochanek;A. Vikhlinin;D. Fabricant;G. Fazio;K. Brand;Michael J. I. Brown;A. Dey;B. Jannuzi;J. Najita;B. McNamara;J. Shields;M. Rieke
我们获得了一张深度为5 kS的钱德拉X射线天文台ACIS-I图，该图显示了NOAO深广场调查的9.3°2 Bootes场。在这里，我们描述了数据采集和分析策略，导致产生具有2个或更多(4个或更多)计数的4642(3293)个点源的目录，对应于0.5-7keV波段的极限通量约为4(8)×10-15ergs cm-2 S-1。这些钱德拉XBootes数据是独一无二的，因为它们构成了迄今观测到的最宽的连续X射线场，流量极限如此微弱。由于ACIS的背景非常低，我们预计只有14%(0.7%)的来源是虚假的。在这次调查中，我们还检测到了43个扩展来源。点源在126个点源(ACIS-I的视场为16‘×16’)中的分布与泊松起伏一致，平均每个点有36.8个点源。虽然点源分布的平滑图像是块状的，但没有统计上显著的证据表明大规模的丝状结构。然而，我们确实发现，对于θ>；1‘，这些源的角相关函数与以前的测量是一致的，并且遵循角与斜率~-0.7%的幂规律。在调查的1.4°2样本中，大约87%的具有4个或更多计数的源具有与R~26 MAG对应的光学对应物。作为NDWFS Bootes区更大的光学光谱学计划的一部分，已经获得了~900个X射线源的光谱，其中大部分是类星体或活动星系核。
We obtained a 5 ks deep Chandra X-ray Observatory ACIS-I map of the 9.3 deg2 Bootes field of the NOAO Deep Wide-Field Survey. Here we describe the data acquisition and analysis strategies leading to a catalog of 4642 (3293) point sources with 2 or more (4 or more) counts, corresponding to a limiting flux of roughly 4(8) × 10-15 ergs cm-2 s-1 in the 0.5-7 keV band. These Chandra XBootes data are unique in that they constitute the widest contiguous X-ray field yet observed to such a faint flux limit. Because of the extraordinarily low background of the ACIS, we expect only 14% (0.7%) of the sources to be spurious. We also detected 43 extended sources in this survey. The distribution of the point sources among the 126 pointings (ACIS-I has a 16′ × 16′ field of view) is consistent with Poisson fluctuations about the mean of 36.8 sources per pointing. While a smoothed image of the point source distribution is clumpy, there is no statistically significant evidence of large-scale filamentary structure. We do find however, that for θ > 1′, the angular correlation function of these sources is consistent with previous measurements, following a power law in angle with slope ~-0.7. In a 1.4 deg2 sample of the survey, approximately 87% of the sources with 4 or more counts have an optical counterpart to R ~ 26 mag. As part of a larger program of optical spectroscopy of the NDWFS Bootes area, spectra have been obtained for ~900 of the X-ray sources, most of which are quasars or active galactic nuclei.