Details

Autor(en) / Beteiligte

• 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.

Titel

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

Ist Teil von

• Astronomy letters, 2021-02, Vol.47 (2), p.71-87

Ort / Verlag

Moscow: Pleiades Publishing

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.