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- Title
Optical Identification of Candidates for Active Galactic Nuclei Detected by the Mikhail Pavlinsky ART-XC Telescope Onboard the SRG Observatory during an All-Sky X-ray Survey.
- Authors
Zaznobin, I. A.; Uskov, G. S.; Sazonov, S. Yu.; Burenin, R. A.; Medvedev, P. S.; Khorunzhev, G. A.; Lyapin, A. R.; Krivonos, R. A.; Filippova, E. V.; Gilfanov, M. R.; Sunyaev, R. A.; Eselevich, M. V.; Bikmaev, I. F.; Irtuganov, E. N.; Nikolaeva, E. A.
- 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 , 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 ( erg s in the 4–12 keV band) and, according to our black hole mass estimate (), 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 ( cm ). 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 () Universe. The SRG sky survey will last for another 3 years or more, which must allow many such objects to be discovered.
- Subjects
ACTIVE galactic nuclei; ACCRETION (Astrophysics); TELESCOPES; X-ray telescopes; OBSERVATORIES; X-rays; SEYFERT galaxies
- Publication
Astronomy Letters, 2021, Vol 47, Issue 2, p71
- ISSN
1063-7737
- Publication type
Article
- DOI
10.1134/S1063773721020067