Intese Wind Found in the Neighbourhood of a Black Hole

An international team of astrophysicists have detected an intesne wind from one of the closest known black hole.

During observations of V404 Cygni, which went into a bright and violent out burst in June 2015 after more than 25 years of quiescence, the team began taking optical measurements of black hole's accretion disc using the 10.4 m Gran Telescopio CANARIAS - the biggest optical - infrared telescope in the world, situated at the Roque deloos Muchachos observatory in the Canary Island.

The results published in Nature, it shows the presence of a wind of natural materials i.e. unionized hydrogen and helium which is formed in the outer layers of the accretion disc, regulation the accretion of material by the black hole. This wind detected for the first time in a system of this type has a very high velocity  which is about 3000 km per second. so that it can escape from the gravitational field around the black hole.

Professor Charles from University of Southampton said, "Its presence allow us to explain why the outburst, in spite of being bright and very violent, with continuous changes in luminosity and ejections of mass in the form of jets, was also very brief, lasting only weeks."

At the end of this outburst the GTC observations revealed the presence of a nebula formed from material expelled by the wind. This phenomenon which has been observed for the first time in a black hole, also allows scientists to estimate the quantity of mass ejected into the interstellar medum;

It is a black hole within a binary system located in the constellation of Cygnus. In such systems, of which less than 50 are known; a black hole of around 10 times the mass of the sun is swallowing material from a very near by star, its companion star. During this process material falls onto the black hole and forms an accretion disc whose hotter inhermost zones emit in X-rays. In the outer regions, however we can study the disc in visible light which is the part of the spectrum observable with the GTC.

This is one of the closest known black hole to the earth, whose distance is only 8,000 light years away from earth; it has a large accretion disc with a radius  pf about 10 million km making its outbursts especially bright at all wavelengths.