SRG/ART-XC all-sky X-ray survey: Catalog of sources detected during the first five surveys

Abstract

We present an updated catalog of sources detected by the Mikhail Pavlinsky telescope aboard the Spektrum-Roentgen-Gamma (SRG) observatory during its all-sky survey. It is based on the data of the first four and the partially completed fifth scans of the sky ( The catalog comprises 1545 sources detected in the 4--12\,keV energy band. The achieved sensitivity ranges between $ near the ecliptic plane and $ near the ecliptic poles, which is a $ 30$--50<!PCT!> improvement over the previous version of the catalog based on the first two all-sky scans (ARTSS12). There are $ 130$ objects, excluding the expected contribution of spurious detections, that were not known as X-ray sources before the SRG/ all-sky survey. We provide information, partly based on our ongoing follow-up optical spectroscopy program, on the identification and classification of the majority of the sources (1463), of which 173 are tentative at the moment. The majority of the classified objects (964) are extragalactic, a small fraction (30) are located in the Local Group of galaxies, and 469 are Galactic. The dominant classes of objects in the catalog are active galactic nuclei (911) and cataclysmic variables (192).