The 31 Deg${}^2$ Release of the Stripe 82 X-ray Survey: The Point Source Catalog

Abstract

We release the next installment of the Stripe 82 X-ray survey point-source catalog, which currently covers 31.3 deg${}^2$ of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy field. In total, 6181 unique X-ray sources are significantly detected with {\it XMM-Newton} ($>5\sigma$) and {\it Chandra} ($>4.5\sigma$). This catalog release includes data from {\it XMM-Newton} cycle AO 13, which approximately doubled the Stripe 82X survey area. The flux limits of the Stripe 82X survey are $8.7\times 10^{-16}$ erg s${}^{-1}$ cm${}^{-2}$, $4.7\times 10^{-15}$ erg s${}^{-1}$ cm${}^{-2}$, and $2.1\times 10^{-15}$ erg s${}^{-1}$ cm${}^{-2}$ in the soft (0.5-2 keV), hard (2-10 keV), and full bands (0.5-10 keV), respectively, with approximate half-area survey flux limits of $5.4\times 10^{-15}$ erg s${}^{-1}$ cm${}^{-2}$, $2.9\times 10^{-14}$ erg s${}^{-1}$ cm${}^{-2}$, and $1.7\times 10^{-14}$ erg s${}^{-1}$ cm${}^{-2}$. We matched the X-ray source lists to available multi-wavelength catalogs, including updated matches to the previous release of the Stripe 82X survey; 88\% of the sample is matched to a multi-wavelength counterpart. Due to the wide area of Stripe 82X and rich ancillary multi-wavelength data, including coadded SDSS photometry, mid-infrared {\it WISE} coverage, near-infrared coverage from UKIDSS and VHS, ultraviolet coverage from {\it GALEX}, radio coverage from FIRST, and far-infrared coverage from {\it Herschel}, as well as existing $\sim$30\% optical spectroscopic completeness, we are beginning to uncover rare objects, such as obscured high-luminosity AGN at high-redshift. The Stripe 82X point source catalog is a valuable dataset for constraining how this population grows and evolves, as well as for studying how they interact with the galaxies in which they live.

accepted for publication in ApJ; 23 pages (emulateapj)

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