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We present a first catalog of sources detected by the Mikhail PavlinskyART-XC telescope on board the SRG observatory in the 4-12 keV energy bandduring its ongoing all-sky survey. The catalog comprises 867 sources detectedon the combined map of the first two 6-month scans of the sky (December 2019 -December 2020). The achieved sensitivity to point sources varies between~4x10^-12 erg/s/cm2 near the ecliptic plane and ~8x10^-13 erg/s/cm2 (4-12 keV)near the ecliptic poles, and the typical localization accuracy is ~15 arcsec.Of the 750 sources of known or suspected origin in the catalog, 56% areextragalactic (mostly active galactic nuclei, AGN; and clusters of galaxies)and the rest are Galactic (mostly cataclysmic variables, CVs; and low- andhigh-mass X-ray binaries). For 114 sources, ART-XC has detected X-rays for thefirst time. Although the majority of these (~80) are expected to be spurious(given the adopted detection threshold), there can be a significant number ofnewly discovered astrophysical objects. We have started a program of opticalfollow-up observations of the new and previously unidentified X-ray sources,which has already led to the identification of several AGN and CVs. With theSRG all-sky survey planned to continue for a total of four years, we can expectthe ART-XC survey in the 4-12 keV band to significantly surpass previoussurveys that were carried out in similar (medium X-ray) energy bands in termsof the combination of angular resolution, sensitivity, and sky coverage.

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