The Russian space telescope “Spektr-RG” has recorded X-ray light from 13 new tidal destruction events (TDE) when a star is torn apart by the gravitational field of a black hole. At the same time, the black hole produces radiation emitted from the inner region of the accretion of matter from the dead star. The discoveries are reported in the preprint of the article published in the repository arxiv.org.
TDES were detected from among the X-ray transients (changing the brightness of X-ray sources) identified by the eROSITA Space Telescope during a sky scan between June 10 and December 14, 2020. The identified TDES have properties similar to those found in previous studies. Of particular interest is the event designated as SRGE J144738. 4+671821, which, unlike the others, continued to emit radiation after its discovery for at least another six months.
The most distant TDE, which is known as SRGE J163831. 7+534020 has a redshift of approximately 0.581, which corresponds to a radial distance (taking into account the accelerated expansion of the Universe) of almost seven billion light-years.
4 of the 13 TDES showed an increase in brightness coinciding with or preceding the X-ray flash. The remaining nine events show no signs of optical activity associated with stellar tidal destruction.
According to scientists, the Spectrum survey of the sky will continue until the end of 2023. The researchers plan to reduce the event detection threshold by about half, which should help find about 700 events by the end of the 4-year review.