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Discovery of the Most X-ray Luminous Quasar SRGE J170245.3+130104 at Redshift
Ist Teil von
Astronomy letters, 2021, Vol.47 (3), p.123-140
Ort / Verlag
Moscow: Pleiades Publishing
Erscheinungsjahr
2021
Quelle
SpringerLink
Beschreibungen/Notizen
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.