The Sloan Digital Sky Survey Reverberation Mapping Project: the XMM-Newton X-Ray Source Catalog and Multiband Counterparts
The Sloan Digital Sky Survey Reverberation Mapping Project: the XMM-Newton X-Ray Source Catalog and Multiband Counterparts
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DOI：
10.3847/1538-4365/abb5b0
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发表时间：
2020-09
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通讯作者：
Teng 腾 Liu 刘;A. Merloni;T. Simm;P. Green;W. Brandt;D. Schneider;T. Dwelly;M. Salvato;J. Buchner;Yue Shen;K. Nandra;A. Georgakakis;L. Ho
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作者：
Teng 腾 Liu 刘;A. Merloni;T. Simm;P. Green;W. Brandt;D. Schneider;T. Dwelly;M. Salvato;J. Buchner;Yue Shen;K. Nandra;A. Georgakakis;L. Ho
XMM-RM项目旨在为斯隆数字巡天混响测绘（SDSS-RM）领域提供x射线覆盖。41张XMM-Newton曝光被放置在钱德拉宙斯盾场周围，覆盖面积为6.13 deg2，标称曝光深度为~ 15 ks。我们提出了在这些数据中检测到的3553个源的x射线目录，使用psf拟合算法和产生约5%伪源的样本选择阈值。除了psf拟合似然之外，我们还基于泊松理论，利用孔径内的源和背景计数计算了第二个源可靠性度量。使用泊松似然，我们选择了一个高纯度的子样本，并发现它具有与以前的x射线调查相似的计数剖面。采用贝叶斯方法“NWAY”来识别光学遗产和红外不智星表中的x射线源，使用由钱德拉x射线源的光学/红外对应物创建的二维不智星等颜色先验。相当数量的光学/红外对应物对应于低探测可能性的源，证明了在目录中保留低可能性探测的价值。共有932个XMM-RM源被SDSS光谱观测覆盖，其中89%被归类为活动星系核，其中71%的活动星系核位于SDSS- rm类星体表中。在SDSS-RM类星体中，80%可以在XMM观测的深度探测到。
The XMM-RM project was designed to provide X-ray coverage of the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) field. Forty-one XMM-Newton exposures, placed surrounding the Chandra AEGIS field, were taken, covering an area of 6.13 deg2 and reaching a nominal exposure depth of ∼15 ks. We present an X-ray catalog of 3553 sources detected in these data, using a PSF-fitting algorithm and a sample selection threshold that produces a ∼5% fraction of spurious sources. In addition to the PSF-fitting likelihood, we calculate a second source reliability measure based on Poisson theory using source and background counts within an aperture. Using the Poissonian likelihood, we select a subsample with a high purity and find that it has number count profiles similar to previous X-ray surveys. The Bayesian method “NWAY” was employed to identify counterparts of the X-ray sources from the optical Legacy and the IR unWISE catalogs, using a two-dimensional unWISE magnitude–color prior created from optical/IR counterparts of Chandra X-ray sources. A significant number of the optical/IR counterparts correspond to sources with low detection likelihoods, proving the value of retaining the low-likelihood detections in the catalog. A total of 932 of the XMM-RM sources are covered by SDSS spectroscopic observations, where 89% of them are classified as active galactic nuclei, and 71% of these active galactic nuclei are in the SDSS-RM quasar catalog. Among the SDSS-RM quasars, 80% are detectable at the depth of the XMM observations.