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arXiv 0905.0496astro-ph.HEastro-ph.CO
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第五次数据发布斯隆数字巡天/XMM-牛顿类星体巡天

The Fifth Data Release Sloan Digital Sky Survey/XMM-Newton Quasar Survey

M. Young, M. Elvis, G. Risaliti

备注：
41 pages (preprint style), 11 figures. Published in ApJS, 183, 17. Minor changes to Tables 1 and 2 have been made in the included erratum. Our results remain unchanged
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摘要：

我们提出了一个目录的792个DR 5 SDSS类星体的光谱，已被观察到的X射线与\emph{XMM-Newton}偶然。这些类星体的红移范围为z = 0.11 - 5.41，星等范围为i = 15.3-20.7。在这个样本中存在大量的射电强（70）和宽吸收线（51）类星体。在2 σ以上的显著X射线探测占样本的87%（685个类星体），473个类星体在6 σ以上被探测到，足以允许X射线光谱拟合。对于探测到的源，约60%的X射线通量在F（2-10 keV）= 1 - 10 x 10^-14尔格·cm^-2·s^-1之间。我们拟合了一个单一的幂律，一个固定的幂律与固有的吸收自由变化，并吸收幂律模型的所有类星体与X射线S/N > 6，导致加权平均光子指数伽玛= 1.91 +/- 0.08，与固有的色散σ_伽玛= 0.38。对于55个（11.6%）更倾向于本征吸收的源，我们发现加权平均N_H = 1.5 +/- 0.3 x 10^21 cm^-2。我们发现伽玛与光学颜色、Delta（g-i）、光学-X射线光谱指数（alpha_ox）和X射线光度显著相关。虽然前两个相关性可以解释为未检测到的固有吸收的伪影，但伽马和X射线光度之间的相关性似乎是真正的物理相关性，表明X射线斜率的枢轴。

英文摘要：

We present a catalog of 792 DR5 SDSS quasars with optical spectra that have been observed serendipitously in the X-rays with the \emph{XMM-Newton}. These quasars cover a redshift range of z = 0.11 - 5.41 and a magnitude range of i = 15.3-20.7. Substantial numbers of radio-loud (70) and broad absorption line (51) quasars exist within this sample. Significant X-ray detections at >2sigma account for 87% of the sample (685 quasars), and 473 quasars are detected at >6sigma, sufficient to allow X-ray spectral fits. For detected sources, ~ 60% have X-ray fluxes between F(2-10 keV) = 1 - 10 x 10^-14 ergs cm^-2 s^-1. We fit a single power-law, a fixed power-law with intrinsic absorption left free to vary, and an absorbed power-law model to all quasars with X-ray S/N > 6, resulting in a weighted mean photon index Gamma = 1.91 +/- 0.08, with an intrinsic dispersion sigma_Gamma = 0.38. For the 55 sources (11.6%) that prefer intrinsic absorption, we find a weighted mean N_H = 1.5 +/- 0.3 x 10^21 cm^-2. We find that Gamma correlates significantly with optical color, Delta(g-i), the optical-to-X-ray spectral index (alpha_ox) and the X-ray luminosity. While the first two correlations can be explained as artefacts of undetected intrinsic absorption, the correlation between Gamma and X-ray luminosity appears to be a real physical correlation, indicating a pivot in the X-ray slope.

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