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A broadband outburst of the compact steep-spectrum quasar 3C 138 in 2024-2026
T. V. Mufakharov, Yu. V. Sotnikova, V. V. Vlasyuk +20
After several decades of relative quiescence, the compact steep-spectrum quasar 3C 138 entered an active phase in 2024-2026, exhibiting strong broadband flaring. We investigate its…
SRGAJ230631.0+155633: an extremely X-ray luminous, heavily obscured, radio-loud quasar at z=0.44 discovered by SRG/ART-XC
Grigory Uskov, Sergey Sazonov, Igor Lapshov +7
We report on a detailed study of a luminous, heavily obscured ( cm), radio-loud quasar SRGAJ230631.0+155633, discovered in the 4--12 keV ene…
SRG/ART-XC all-sky X-ray survey: Catalog of sources detected during the first five surveys
S. Sazonov, R. Burenin, E. Filippova +27
We present an updated catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope aboard the Spektrum-Roentgen-Gamma (SRG) observatory during its all-sky survey. It is ba…
New Active Galactic Nuclei Detected by the ART-XC and eROSITA Telescopes during the First Five SRG All-Sky X-ray Surveys
Grigory Uskov, Sergey Sazonov, Igor Zaznobin +8
We present the results of our identification of 14 X-ray sources detected in the eastern Galactic sky ( ) in the 4-12 keV energy band on the combined map of the firs…