How did Super-Massive Black Holes form? How have they grown so massive? Ancient actively-accreting black holes like this one must hold clues.
The x-rays from this quasar, named J0921+0007, had to travel a long way through space and time to reach us. The instrument it reached was the x-ray instrument on the Spektr-RG space observatory. eROSITA found the quasar in its Final Equatorial-Depth Survey The Chandra Space Telescope also spotted it.
That survey is important because, currently, astrophysicists know of only 50 quasars with redshift z>5.7, when the Universe was less than one billion years old. By finding more, scientists hope to place a lower limit on black hole accretion well into theThis quasar is especially interesting because its so bright in x-rays. But it’s also a low-mass black hole with only 250 million solar masses. Most high redshift galaxies like this one host black holes with between one to tensolar masses.
“We did not expect to find such a low-mass AGN already in our very first mini-survey with eROSITA”, said lead author Wolf, who searches for the most distant supermassive black holes in eROSITA data as part of his Ph.D. “It is the most distant serendipitous X-ray detection to date and its properties are rather atypical for quasars at such high redshifts: it is intrinsically faint in visible light but very luminous in X-rays.”. They’re a type of active galaxy in the local Universe.
X-ray image cutouts in the region of J0921+0007. The eROSITA/eFEDS image is on the left, the high-resolution Chandra image is on the right. Image Credit: MPE
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