论文标题
搜索3xmm目录中的X射线吸收源，使用光度红移和贝叶斯光谱拟合
A search for X-ray absorbed sources in the 3XMM catalogue, using photometric redshifts and Bayesian spectral fits
论文作者
论文摘要
自1999年推出以来，XMM- \ textit {Newton}任务已编译了最大的串行X射线源目录，其中3xMM是该目录的第三版。这是因为大型有效区域（1 keV时为5000 $ \ rm cm^2 $）和广阔的视野（30 arcmin）的组合。 3xmm-DR6目录在982 $ \ rm ver^2 $的面积上包含约470,000个唯一的X射线源。其中很大一部分（100,178个来源）在SDSS，PANSTARRS，VIDEO，UKIDSS和WISE SERVEYS中具有可靠的光学，接近/中期的光学。在上一篇论文中，我们使用TPZ机器学习算法为这些来源提供了光度红移。其中约有四分之一（22,677）具有足够的光子统计数据，因此可以提取可靠的X射线光谱。显然，由于X射线计数选择和光学对应物约束，上面的样本偏向明亮的来源。在这里，我们提出XMMFITCAT-Z：使用贝叶斯X射线分析（BXA）技术的这些来源的光谱拟合目录。作为当前目录潜力的科学演示，我们对765 X射线吸收来源的光学和中期颜色进行评论，并使用$ N_ \ Mathrm {H}> 10^{22} \，\ Mathrm {cm}^{cm}^{-2} $。我们表明，在MID-IR W1-W2与W2选择标准之后，大量X射线所选AGN不会被归类为AGN。这些是具有较低亮度的AGN，其中宿主星系对miR发射的贡献是不可忽略的。在X射线中，只有三分之一的遮盖AGN呈现红色或R-W2> 6。然后看来，与标准的X射线选择标准相比，文献中通常用于选择遮盖的AGN的R-W2标准可产生非常不同的X射线吸收AGN样品。
Since its launch in 1999, the XMM-\textit{Newton} mission has compiled the largest catalogue of serendipitous X-ray sources, with the 3XMM being the third version of this catalogue. This is because of the combination of a large effective area (5000 $\rm cm^2$ at 1 keV) and a wide field of view (30 arcmin). The 3XMM-DR6 catalogue contains about 470,000 unique X-ray sources over an area of 982 $\rm deg^2$. A significant fraction of these (100,178 sources) have reliable optical, near/mid-IR counterparts in the SDSS, PANSTARRS, VIDEO, UKIDSS and WISE surveys. In a previous paper we have presented photometric redshifts for these sources using the TPZ machine learning algorithm. About one fourth of these (22,677) have adequate photon statistics so that a reliable X-ray spectrum can be extracted. Obviously, owing to both the X-ray counts selection and the optical counterpart constraint, the sample above is biased towards the bright sources. Here, we present XMMFITCAT-Z: a spectral fit catalogue for these sources using the Bayesian X-ray Analysis (BXA) technique. As a science demonstration of the potential of the present catalogue, we comment on the optical and mid-IR colours of the 765 X-ray absorbed sources with $N_\mathrm{H} > 10^{22}\,\mathrm{cm}^{-2}$. We show that a considerable fraction of X-ray selected AGN would not be classified as AGN following the mid-IR W1-W2 vs. W2 selection criterion. These are AGN with lower luminosities, where the contribution of the host galaxy to the MIR emission is non-negligible. Only one third of obscured AGN in X-rays present red colours or r-W2 > 6. Then it appears that the r-W2 criterion, often used in the literature for the selection of obscured AGN, produces very different X-ray absorbed AGN samples compared to the standard X-ray selection criteria.
