The activity of the black hole can be observed in the visible range



astronomers from Kyoto University reassure amateur astronomers around the world. In a paper published in the journal Nature, they have shown how it is possible to observe the activity of certain types of black holes in the visible range using a conventional telescope.

Since the gravitational pull of the black hole does not give any radiation from leaving the region bounded by the event horizon, directly observe them physically impossible. Usually, their detection is due to the presence of around a black hole accretion disks.

During the fall of matter into a black hole because of the rotation of the gas holes are formed around the disc of interstellar gas and dust. Substance drive accelerates to relativistic velocities and heated to millions of degrees, because of which radiates in different ranges. Up to this point, scientists searched for light from the accretion in the X-ray and gamma-ray and infrared - which could not afford the usual amateur astronomers.

But Japanese astronomers have shown that in binary systems, where one of the participants is a black hole every few decades occur bright flashes. During such outbreaks substance emits a broad spectrum, including the visible range.

The study was conducted on the example of the object V404 Cygni - one of the closest to the world of binary systems containing a black hole. V404 Cygni «woke up" after 26 years of quiet and let out a flare, recorded by astronomers June 15, 2015.

Astronomers from the University of Kyoto in conjunction with specialists from the Japanese space agency JAXA, the National Laboratory of RIKEN and Hiroshima University have shown that visible light is due to x-ray the inner parts of the accretion disk. This radiation heats the outer layers of the disc, which during heating emit light in the visible range.

"Now we know we can make observations in the visible range, and that black holes can be detected without special telescopes observed in X-ray or gamma-ray" - pleased Mariko Kimura [Mariko Kimura], Master of the University.

Source: geektimes.ru/post/268868/

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