Owned by NASA Orbital Observatory Swift discovered the black hole of stellar mass (that is, not supermassive) in the center of the milky Way. To make it it was possible to register a powerful burst of x-ray radiation from the black hole, at a time when that swallowed up a large cloud surrounding substance.

The phenomenon, called astronomers "new x-ray", is extremely rare.

Although Swift since the commissioning in 2004 was designed for the opening of such objects, it is still the first registered them with new x-ray. (Here and below illustrate NASA's Goddard Space Flight Center.)

"X-ray novae" (by analogy with the usual new star) is called short-lived x-ray source, the peak radiation which usually does not exceed a few days and followed several months of falling intensity gradually reduced to almost zero. Radiation arises when large quantities of substances fall to very dense objects like neutron star or black hole.

Such surge was registered orbital Observatory 16 September 2012 in the constellation Sagittarius, at the core of our Galaxy. The distance to the object is defined with large assumptions and is estimated at 20-30 thousand light years. This difference is caused including by that the object is Swift J1745-26 (in accordance with its coordinates) is hidden dense dust clouds, not giving observed in the visible range.

"Bright new x-ray so rare that, in essence, they occur no more than once per mission [space telescope], and this is the first in the practice of Swift, " says Neil Gehrels, leading researcher of the project of the Center of space flights of the name Goddard. - It is really something that we have been waiting for".

At the peak radiation from falling in BH substances (18 September) had a photon energy of up to 10,000 electron volts. This coincides with the level of emission from PSR B0531+21, neutron stars formed on the place of supernova SN 1054, which exploded in the crab nebula (detected by terrestrial astronomers in 1054).

According to calculations, this BH, apparently, was a member of the double star system, in which, besides it is normal sun-like star. From it to the BH flows of gas and dust. Normal dust ring around the black hole gradually falls in the hole, generating a relaxing homogeneous x-ray radiation (heat in the fall).

But if the gas and dust flow from the stars are not evenly distributed and large "chunks", the mechanism of absorption of matter strays. After the wild "privatization" has accumulated about BH mass occurs when the matter is not around and nothing falls on BH. Gas begins to accumulate in the disk, rather slowly rotating on the relative distance from BH and therefore cool (not to Shine in x-ray range). As the accumulation of a substance it begins to fall on BH, warming up sharply and emitting radiation, characterizing "new x-ray":