Astronomers have found the brightest x-ray quasar with high redshift

With the help of Observatory “Spektr-RG” astronomers discovered that the quasar CFHQSJ142952+544717 very strongly emits in x-rays — so much so that it makes it the brightest x-ray quasars of high redshift. A Preprint of the article is available on the website

Quasars are among the brightest objects in the visible Universe, it is a very distant galaxy, the center of which is a supermassive black hole actively swallowing the surrounding matter. The more intensive are the processes of accretion, the brighter the quasar, i.e., the more photons it emits.

Many quasars are so far away from us that we see light that was emitted by them in a time when the Big Bang was only a few billion years. Astronomers are particularly interested in objects with a redshift z > 6,0, because they can study the processes taking place in the early Universe and to learn about the evolution of quasars.

Pavel Medvedev (Medvedev P.) from the Institute of space research together with colleagues discovered that one of the known quasars with strong emission in the radio band, CFHQSJ142952+544717 also powerfully radiates in the x-ray range in comparison with other similar objects. Its luminosity in x-rays amounted to about 2.6×1046 ergs per second. Given the fact that the redshift of the quasar is z is equal 6,18 — it is the brightest x-ray quasars with a redshift greater than 6.

Bolometric luminosity CFHQSJ142952+544717 was from 2×1047 to 3×1047 erg / sec. Based on these data, astronomers can estimate the mass of the Central black hole, which was half a billion times the mass of the Sun.

Astronomers assume that the high brightness x-ray emission of quasar in comparison with optical and UV may be connected with his radiogrammetry — in particular, the contribution of inverse Compton scattering of the photons of the microwave background radiation by relativistic electrons of the jet. In this case CFHQSJ142952+544717 can be one of the many quasars with strong emission in the radio band, which also has a large x-ray brightness.

X-ray Observatory “Spektr-RG”, through which the discovery was made, has begun to fulfill the main scientific program until the end of last year. In June, the German telescope eROSITA, is on its Board, made the first sky survey in the soft x-ray range.

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