“Spektr-RG” saw the revival of the black hole

X-ray space Observatory “Spektr-RG” managed to catch the moment of awakening of the black hole x-ray binary system 4U 1755-338, which was in rest mode for more than twenty years. This was evident in the burst of x-rays caused by the active absorption of black hole substance, dragged from the companion star, reported on the website IKI.

Launch of the space Observatory “Spektr-RG” was held July 13, 2019. It is equipped with two telescopes — then ART-XC and eROSITA German. The machine must conduct a comprehensive review of the entire sky in x-rays, more about this can be read in our material “We will carry out a total census”. In October of last year, “Spektr-RG” reached its target orbit around the libration point L2 and started to work.

During observations of April 1, 2020, the telescope ART-XC has detected a bright source at the center of the milky Way. He was identified as low-mass x-ray binary system 4U 1755-338that opened the first x-ray space Observatory, Uhuru, in 1970. The system represents microquasar, there is a active candidate to black holes, the orbital period is 4.4 hours.

In 1996, 4U 1755-338 moved to the stage of calmness and showed no signs of activity for more than twenty years, however, new data say about the revival of the black hole and active absorption of its substance, dragged from the companion star, which is manifested in the increase in the flow of both soft and hard x-ray study from the source.

To date, the Observatory has already completed a review of half of the celestial sphere, and by June will construct the first map of the entire sky. In the future, this map will be updated every six months, this is due to a change in the orientation of the orbit of the Observatory relative to the distant stars along with the movement of the Earth around the Sun.

Earlier we talked about how the “Spektr-RG” proved the dual identity of the system to a rare type, and considered the Mouse in the center of the milky Way.

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