An international team of astronomers reports the discovery of newer high-redshift quasars from
The redshifted 412 new quasars amount tofrom 4.44 to 6.53. The scientists' findings are based on DR9 DESI Legacy Imaging Surveys photometry data combined with Pan-STARRS1 data and J-band photometry from publicly available catalogs.
It is noteworthy that initially astronomersidentified 556 quasars, but the existence of 144 was already known to science. In the end, scientists discovered 412 quasars, 25 of them at very high redshifts greater than 6.0. One of them, designated DESI J144355+350055 at redshift 6.53, is the highest redshift new quasar identified in their study to date.
Quasars are extremely bright active nucleigalaxies containing supermassive central black holes with accretion disks. Their redshift is measured by the strong spectral lines that dominate their visible and ultraviolet spectra.
Astronomers are especially interestedin the discovery of new quasars with a high redshift (above 4.4), since they are the brightest and most distant compact objects in the observable Universe. Their spectra can be used to estimate the mass of supermassive black holes, constraining models of the evolution and formation of quasars. In addition, high-redshift quasars, which are also radio-bright, are unique indicators of the activity of supermassive black holes in the early Universe.
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Cover photo: ESO/M. Kornmesser