![\"Russian](\"https:\/\/www.europesays.com\/uk\/wp-content\/uploads\/2025\/04\/russian-astronomers-in.jpg\" "\\"Smoothed")
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Smoothed X-ray image of SRGA J2306+1556. Credit: arXiv (2025). DOI: 10.48550\/arxiv.2504.13658<\/p>\n
Using the Spektr-RG (SRG) space observatory, astronomers from the Russian Academy of Sciences have inspected a radio-loud quasar known as SRGA J2306+1556, which is extremely luminous in the X-ray band. Results of the new study are reported<\/a> in a research paper published April 18 on the arXiv preprint server.<\/p>\n Quasars, or quasi-stellar objects (QSOs), are active galactic nuclei<\/a> (AGN) of very high luminosity powered by supermassive black holes<\/a> (SMBHs), emitting electromagnetic radiation observable in radio, infrared, visible, ultraviolet and X-ray wavelengths. They are among the brightest and most distant objects in the known universe, and serve as fundamental tools for numerous studies in astrophysics as well as cosmology.<\/p>\n SRGA J2306+1556 is a radio-loud quasar at a redshift of approximately 0.44, discovered in 2022 with Spektr-RG. Previous observations of SRGA J2306+1556 have found that it is heavily obscured and its intrinsic X-ray luminosity exceeds 4.0 quattuordecillion erg\/s.<\/p>\n Recently, a team of astronomers led by Grigory Uskov decided to re-investigate SRGA J2306+1556 with Spektr-RG in order to get more insights into its nature. Their study was complemented by data from NASA’s Swift spacecraft.<\/p>\n “To study this interesting quasar in detail, we organized its follow-up pointed X-ray observations with SRG\/ART-XC and the XRT telescope aboard the Neil Gehrels Swift observatory, which revealed a strongly absorbed X-ray spectrum,” the researchers wrote in the paper.<\/p>\n During the new observations, the unabsorbed X-ray luminosity of SRGA J2306+1556 ranged between 1.0 and 6.0 quattuordecillion erg\/s, and the source exhibited a strongly absorbed X-ray spectrum. The astronomers noted that such X-ray luminous obscured AGN are extremely rare at redshifts below 0.5.<\/p>\n The collected data indicate that SRGA J2306+1556 experienced an X-ray outburst in 2020\u20132021 and was in a “low” state in June 2023. The researchers estimate that the outburst could have lasted about one year or more.<\/p>\n Furthermore, it was found that SRGA J2306+1556 showcases a complex morphology in the radio band with a core and two extended radio lobes. The findings suggest that the radio counterpart of SRGA J2306+1556 is a giant radio galaxy (GRG) of the FR II type with a radio power at a level of 286 YW\/Hz, which is equivalent to 0.004 quattuordecillion erg\/s.<\/p>\n The study also found that SRGA J2306+1556 has a bolometric luminosity of around 60 quattuordecillion erg\/s and that its central black hole has a mass of about 1.4 billion solar masses.<\/p>\n Summing up the results, the authors of the paper underlined that SRGA J2306+1556 is one of the most luminous obscured quasars in the observable universe and accretes mass at a high rate.<\/p>\n More information:<\/strong> \n\t\t\t\t\t\t\t\t\t\t\t\t\tJournal information:<\/strong> \t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n \n\t\t\t\t\t\t\t\t\t\t\t\t \u00a9 2025 Science X Network\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n \n\t\t\t\t\t\t\t\t\t\t\t\tCitation<\/strong>: \n\t\t\t\t\t\t\t\t\t\t\t This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
\n\t\t\t\t\t\t\t\t\t\t\t\tGrigory Uskov et al, SRGAJ230631.0+155633: an extremely X-ray luminous, heavily obscured, radio-loud quasar at z=0.44 discovered by SRG\/ART-XC, arXiv (2025). DOI: 10.48550\/arxiv.2504.13658<\/a><\/p>\n
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tarXiv<\/a>
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n
\n\t\t\t\t\t\t\t\t\t\t\t\tAstronomers investigate an extremely X-ray-luminous, radio-loud quasar (2025, April 29)
\n\t\t\t\t\t\t\t\t\t\t\t\tretrieved 29 April 2025
\n\t\t\t\t\t\t\t\t\t\t\t\tfrom https:\/\/phys.org\/news\/2025-04-astronomers-extremely-ray-luminous-radio.html\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n
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