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 \(l\simeq 20^{\circ}\) (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 \({\simeq}24\text{ deg}^{2}\) with a median sensitivity of \(8\times 10^{-13}\) erg s\({}^{-1}\) cm\({}^{-2}\) (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 \(z\simeq 0.121\).

中文翻译：

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SRG/ART-XC 银河经度附近的银河平面巡天 $$\boldsymbol{L\simeq 20^{\circ}}$$ ：来源目录

摘要

我们提供了 SRG 空间天文台上的 Mikhail Pavlinsky ART-XC 望远镜在 10 月份对经度\(l\simeq 20^{\circ}\)（L20 场）附近的银河平面区域进行观测期间检测到的源目录2019年，在扫描模式下对L20场进行了四次观测，提供了天空区域的均匀覆盖，总面积为\({\simeq}24\text{deg}^{2}\)，灵敏度中值\ (8\times 10^{-13}\) erg s \({}^{-1}\) cm \({}^{-2}\) (at 50 \(\%\)检测完整性）在4-12 keV能带。结果，我们检测到了 29 个达到统计显着水平的 X 射线源，其中 11 个以前未被其他 X 射线天文台检测到。初步估计表明，其中四个可能本质上是河外的。我们还表明，源 SRGA J183220.1 \(-\) 103508 (CXOGSG J183220.8 \(-\) 103510) 最有可能是一个包含位于红移\(z\simeq 0.121\)的明亮射电星系的星系团。