Abstract

We present the results of our identification of eight objects from the preliminary catalogue of X-ray sources detected in the 4–12 keV energy band by the Mikhail Pavlinsky ART-XC telescope onboard the SRG observatory during the first all-sky survey. Three of them (SRGA J005751.0+210846, SRGA J\(014157.0{-}032915\), SRGA J232446.8+440756) have been discovered by the ART-XC telescope, while five have already been known previously as X-ray sources, but their nature has remained unestablished. The last five sources have also been detected in soft X-rays by the eROSITA telescope of the SRG observatory. Our optical observations have been carried out at the 1.6-m AZT-33IK telescope of the Sayan Observatory and the 1.5-m Russian–Turkish telescope (RTT-150). All of the investigated objects have turned out to be active galactic nuclei (AGNs) at redshifts from 0.019 to 0.283. Six of them are Seyfert 2 galaxies (including one Seyfert 1.9 galaxy), one (SRGA J005751.0+210846) is a ‘‘hidden’’ AGN (in an edge-on galaxy), and one (SRGA J224125.9+760343) is a narrow-line Seyfert 1 galaxy. The latter object is characterized by a high X-ray luminosity (\({\sim}(2-13)\times 10^{44}\) erg s\({}^{-1}\) in the 4–12 keV band) and, according to our black hole mass estimate (\({\sim}2\times 10^{7}M_{\odot}\)), an accretion rate close to the Eddington limit. All three AGNs discovered by the ART-XC telescope (which are not detected by the eROSITA telescope) are characterized by a high absorption column density (\(N_{\textrm{H}}\gtrsim 3\times 10^{23}\) cm\({}^{-2}\)). The results obtained confirm the expectations that the ART-XC telescope is an efficient instrument in searching for heavily obscured and other interesting AGNs in the nearby (\(z\lesssim 0.3\)) Universe. The SRG sky survey will last for another 3 years or more, which must allow many such objects to be discovered.

中文翻译：

---

在全天候X射线调查中，由SRG天文台的Mikhail Pavlinsky ART-XC望远镜检测到的活跃银河核候选物的光学识别

摘要

我们展示了在第一次全天空调查期间，由SRG天文台的Mikhail Pavlinsky ART-XC望远镜在4-12 keV能带中检测到的X射线源初步目录中的八个物体的鉴定结果。其中三个（SRGA J005751.0 + 210846，SRGA J \（014157.0 {-} 032915 \）SRGA J232446.8 + 440756）是由ART-XC望远镜发现的，而以前已经有5个被称为X射线源，但其性质尚未确定。SRG天文台的eROSITA望远镜在软X射线中也检测到了最后五个源。我们的光学观测是在萨彦天文台的1.6米AZT-33IK望远镜和1.5米的俄土耳其望远镜（RTT-150）上进行的。所有研究的对象都被证明是活动的银河核（AGN），其红移从0.019到0.283。其中六个是塞弗特2星系（包括一个塞弗特1.9星系），一个（SRGA J005751.0 + 210846）是一个``隐藏的''AGN（在边缘星系中），另一个是（SRGA J224125.9 + 760343 ）是塞弗特1星系的窄线。后一个物体的特点是X射线的光度高（\（{\ sim}（2-13）\乘以10 ^ {44} \） erg s \（{} ^ {-1} \）在4–12 keV频带中），并根据我们的黑洞质量估计（\（{\ sim} 2 \乘以10 ^ {7} M _ {\ odot} \）），吸积率接近爱丁顿极限。ART-XC望远镜发现的所有三个AGN（eROSITA望远镜均未检测到）的特征是吸收柱密度高（\（N _ {\ textrm {H}} \ gtrsim 3 \乘以10 ^ {23} \ ） cm \（{} ^ {-2} \））。获得的结果证实了对ART-XC望远镜是搜索附近附近严重遮挡的AGN和其他有趣的AGN的有效工具的期望（\（z \ lesssim 0.3 \）） 宇宙。SRG的天空勘测还将持续3年或更长时间，这必须允许发现许多此类物体。