Srga J2306 Srga X -ray Image + 1556. Credit: arxiv (2025). DOI: 10.48550 / Arxiv.2504.13658
Using the Spektr-RG space observatory (SRG), astronomers of the Russian Academy of Sciences inspected a quasar radio-peu known as SRGA J2306 + 1556, which is extremely bright in the X-ray band. The results of the new study are reported in a research document published on April 18 arxiv pre -printed server.
The quasars, or quasi-studs objects (QSO), are very high galactic (AGN) nuclei (AGN) of very high brightness fueled by supermassive black holes (SMBH), emitting an electromagnetic radiation observable in the radio, infrared, visible, ultraviolet and x-radial rays. They are among the most brilliant and most distant objects of the known universe and serve as fundamental tools for many studies in astrophysics as well as cosmology.
SRGA J2306 + 1556 is a quasar radio-luoud with a red lag of approximately 0.44, discovered in 2022 with Spektr-RG. The previous observations of SRGA J2306 + 1556 have found that it is strongly obscured and its intrinsic X -ray brightness exceeds 4.0 Quattuorordion erg / s.
Recently, a team of astronomers led by Grigory Uskov has decided to reinvest Srga J2306 + 1556 with Spektr-Rg in order to better understand its nature. Their study was supplemented by data from the NASA rapid spaceship.
“To study this interesting quasar in detail, we organized its observations of specific X-rays with SRG / Art-XC and the XRT telescope aboard the Swift Observatory of Neil Gehrels, which revealed a spectrum of strongly absorbed X-rays,” wrote the researchers in the article.
During new observations, the brightness with non -absorbed X -rays of SRGA J2306 + 1556 varied between 1.0 and 6.0 Quattuordecillion erg / s, and the source presented a highly absorbed X -ray spectrum. Astronomers have noted that such light obscured AGNs are extremely rare to red offsets below 0.5.
The data collected indicates that SRGA J2306 + 1556 experienced an explosion of X-ray in 2020-2021 and was in a “low” state in June 2023. The researchers estimate that the brilliance could have lasted approximately a year or more.
In addition, it was found that Srga J2306 + 1556 presents a complex morphology in the radio strip with a nucleus and two extended radio lobes. The results suggest that the SRGA J2306 + 1556 radio counterpart 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.
The study also revealed that SRGA J2306 + 1556 has a bolometric brightness of about 60 erg / s of quattuordecillion and that its central black hole has a mass of approximately 1.4 billion solar masses.
Summarizing the results, the authors of the article stressed that SRGA J2306 + 1556 is one of the darkest obscured quasars in the observable universe and accrete the mass at a high rate.
More information:
Grigory Uskov et al, srgaj230631.0 + 155633: an extremely x, very obscured radio-radiophyme quasar, radio at Z = 0.44 discovered by Srg / Art-XC, arxiv (2025). DOI: 10.48550 / Arxiv.2504.13658
Newspaper information:
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Quote: Astronomers are investigating a Radio-Radio-Radio-Rradica quasar (2025, April 29) recovered on April 29, 2025 from
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