2024ApJ...974..156P

We present an enhanced version of the publicly available Stripe 82X catalog (S82-XL), featuring a comprehensive set of 22,737 unique X-ray point sources identified with a significance ≳4σ. This catalog is four times larger than the original Stripe 82X catalog, by including additional archival data from the Chandra and XMM-Newton telescopes. Now covering ∼54.8 deg² of nonoverlapping sky area, the S82-XL catalog roughly doubles the area and depth of the original catalog, with limiting fluxes (half-area fluxes) of 3.4 × 10^–16 (2.4 × 10^–15), 2.9 × 10^–15 (1.5 × 10^–14), and 1.4 × 10^–15 (9.5 × 10^–15) erg s^–1 cm^–2 across the soft (0.5-2 keV), hard (2-10 keV), and full (0.5-10 keV) bands, respectively. S82-XL occupies a unique region of flux-area parameter space compared to other X-ray surveys, identifying sources with rest-frame luminosities from 1.2 × 10³⁸ to 1.6 × 10⁴⁷ erg s^–1 in the 2-10 keV band (median X-ray luminosity, 7.2 × 10⁴³ erg s^–1), and spectroscopic redshifts up to z ∼ 6. By using hardness ratios, we derived the obscuration of active galactic nuclei (AGNs), obtaining a median value of ${\rm{log}}({N}_{{\rm{H}}}/{{\rm{cm}}}^{-2})={21.6}_{-1.6}^{+1.0}$ and an overall, obscured fraction (${\rm{log}}({N}_{{\rm{H}}}/{{\rm{cm}}}^{-2})\gt 22$) of ∼36.9%. S82-XL serves as a benchmark in X-ray surveys and, with its extensive multiwavelength data, is especially valuable for comprehensive studies of luminous AGNs.