Discovery of the Most X-ray Luminous Quasar SRGE J170245.3+130104 at Redshift $$\boldsymbol{z\approx 5.5}$$

  title={Discovery of the Most X-ray Luminous Quasar SRGE J170245.3+130104 at Redshift \$\$\boldsymbol\{z\approx 5.5\}\$\$},
  author={G. A. Khorunzhev and Alexander V. Meshcheryakov and P Medvedev and V. D. Borisov and Rodion Burenin and Roman A. Krivonos and R. Uklein and Elena Shablovinskaya and Vladimir Afanasyev and Serguei N. Dodonov and Rashid Alievich Sunyaev and Sergey Yu. Sazonov and M. R. Gilfanov Space Research Institute Ras and Kazan Federal University and Faculty of Mathematics and Cybernetics Lomonosov Moscow State University and Special Astrophysical Observatory Ras and Max-Planck-Institut fur Astrophysik - Garching},
SRGE J170245.3+130104 was discovered by the eROSITA telescope aboard the SRG space observatory on March 13-15, 2020 during the first half-year scan of its all-sky X-ray survey. The optical counterpart of the X-ray source was photometrically identified as a distant quasar candidate at z ≈ 5.5. Follow-up spectroscopic observations, done in August/September 2020 with the SCORPIO-II instrument at the BTA 6-m telescope, confirmed that SRGE J170245.3+130104 is a distant quasar at redshift zspec = 5… Expand
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