The Most X-ray Luminous High-redshift Quasar Has Been Spotted


A team of Russian researchers utilized the Spektr-RG (SRG) spacecraft and examined a sample of distant quasi-stellar objects (QSOs), also known as quasars. 

The astronomers detected strong X-ray emissions from source CFHQSJ142952+544717, one of the most X-ray luminous high-redshift quasars spotted so far. Here is everything you need to know.

New Quasar Research Unveils Intriguing Details

Quasars are some luminous active galactic nuclei (AGN) comprising supermassive central black holes with accretion disks. Their redshifts are evaluated from the most powerful spectral lines that dominate their noticeable and ultraviolet spectra. All spotted quasar spectra have redshifts between 0.056 and 7.54. 

The researchers led by Pavel Medvedev from the Space Research Institute of the Russian Academy of Sciences have discovered that one known quasi-stellar object (QSO), CFHQSJ142952+544717 (a radio-loud quasar at a redshift of around 6.18) also manifests significant X-ray emission. The discovery was realized utilizing the eROSITA telescope onboard the Spektr-RG satellite. 

Besides being radio-loud, CFHQSJ142952+544717 is also X-ray bright in comparison to most quasars. The X-ray brightness of CFHQSJ142952+544717 was calculated at around 25 quattuordecillion erg/s in the 2.0-10 keV energy band. Such a thing means that the quasi-stellar object is now the most X-ray luminous quasar ever spotted at a redshift over 6.0. 

The biometric brightness of CFHQSJ142952+544717 was approximated between 200 and 300 quattuordecillion erg/s. This result makes it one of the highest quasars ever found at redshifts bigger than 5.7. Also, assuming that the biometric brightness doesn’t surpass the Eddington limit, it indicates the mass of the supermassive black hole in the quasar to be approximately 1.5 billion solar masses. 

Trying to explain the great X-ray luminosity of CFHQSJ142952+544717 relative to the ultraviolet/optical emission, the team suppose that it might be related to the quasar’s radio loudness. “It might be related to its radio loudness, specifically to a plausible contribution of inverse Compton scattering of high-energy-density CMB photons off relativistic electrons in the jets,” detailed the authors of the study. 

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