SRG/ART-XC Galactic Plane Survey near Galactic Longitude L 20°: Catalog of Sources
Sazonov, S. Yu.; Lutovinov, A. A.; Karasev, D. I.; Burenin, R. A.; Tkachenko, A. Yu.; Mereminskiy, I. A.; Krivonos, R. A.; Pavlinsky, M. N.; Arefiev, V. A.; Semena, A. N.; Buntov, M. V.; Lapshov, I. Yu.; Levin, V. V.; Shtykovsky, A. E.
Russia
Abstract
We present a catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope onboard the SRG space observatory during the observations of the Galactic plane region near a longitude l~20° (L20 field) in October 2019. The L20 field was observed four times in the scanning mode, which provided a uniform coverage of the sky region with a total area of ~24 sq. deg. with a median sensitivity of 8e-13 erg/s/cm2 (at 50% detection completeness) in the 4-12 keV energy band. As a result, we have detected 29 X-ray sources at a statistically significant level, 11 of which have not been detected previously by other X-ray observatories. Preliminary estimates show that four of them can presumably be extragalactic in nature. We also show that the source SRGA J183220.1-103508 (CXOGSG J183220.8-103510) is most likely a galaxy cluster containing a bright radio galaxy at redshift z~0.121.