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- Title
Discovery of the Most X-ray Luminous Quasar SRGE J170245.3+130104 at Redshift.
- Authors
Khorunzhev, G. A.; Meshcheryakov, A. V.; Medvedev, P. S.; Borisov, V. D.; Burenin, R. A.; Krivonos, R. A.; Uklein, R. I.; Shablovinskaya, E. S.; Afanasiev, V. L.; Dodonov, S. N.; Sunyaev, R. A.; Sazonov, S. Yu.; Gilfanov, M. R.
- Abstract
During the first all-sky survey of the SRG orbital observatory, the X-ray source SRGE J170245.3+130104 was discovered with the eROSITA telescope on March 13–15, 2020. Its optical counterpart was identified by photometric attributes as a candidate for distant quasars at . The spectroscopic observations of the object carried out in August and September 2020 at the 6-m BTA telescope with the SCORPIO-II instrument confirmed that SRGE J170245.3+130104 is a quasar at redshift . According to the eROSITA data obtained during the first sky survey, the X-ray luminosity of the quasar is erg s in the 2–10 keV energy band, while its X-ray spectrum can be approximately fitted by a power law with a slope . The quasar was detected again with the eROSITA telescope half a year later (on September 13–14, 2020) during the second sky survey, with its X-ray luminosity, probably, having decreased approximately by a factor of 2 at a confidence level . SRGE J170245.3+130104 has turned out to be the most X-ray luminous quasar among all of the known quasars at redshifts . At the same time, it is also one of the radio loudest distant quasars (radio loudness ), which may imply that this is a blazar. We present a catalog of all the quasars at detected in X-rays to date.
- Subjects
QUASARS; REDSHIFT; X-rays; X-ray spectra; ASTRONOMICAL surveys; ACTIVE galactic nuclei; ENERGY bands
- Publication
Astronomy Letters, 2021, Vol 47, Issue 3, p123
- ISSN
1063-7737
- Publication type
Article
- DOI
10.1134/S1063773721030026