Black-Hole

The closet binary supermassive black hole system in the galaxy has discovered by astronomers. The galaxy that consists the supermassive black hole named as NGC 7674 and it is located 400 million light years from the Earth. As per the information, the distance between the two supermassive black hole is less than one light year. This information is given by Professor David Merritt, from Rochester Institute of Technology. Information says the previously recorded distance between a black holes binary was around 24 light years. So this new separation distance of black hole is the smallest separation detected ever.

The new detection also confirms that the combined mass of the two supermassive black hole is roughly around 40 million times the mass of the Sun. The orbital period of the binary is close to 100,000 years. Prof. Merritt also informed that a smaller black hole occurs when the massive stars explode as a supernova.

In 2015, a collision of stellar-mass black hole gravitational waves detected by Laser Interferometer Gravitational-wave Observatory (LIGO). The recent detection of LIGO says that there are some binary black holes which roughly 10 times the mass of the Sun.

Supermassive binary generates gravitational waves having a very low frequency so LIGO can’t detect its signal. In case of stellar-mass binaries, the gravitational waves frequency is high and can detect by LIGO. Professor Merrit and his colleagues Preeti Kharb and Dharam Vir Lal from the National Centre for Radio Astrophysics (NCRA), Tata Institute of Fundamental Research, decided to use all radio telescopes presented all over the work. It will work as a single large telescope. So that the telescope could give a resolution close to 10 million times the angular resolution of the human eye.

The research team also confirmed that two compact sources of radio emission at the center of NGC 7674 detected with the help of very long baseline interferometry (VLBI). The team also found that the single source of radio emission resolved into two sources at 15 GHz. The properties of the two radio sources are similar to massive black holes accreting gas which gives a clue to the presence of two massive black holes. The NGC will emit large radio waves, the team believes. This shows that in a faraway galaxy a compact z-shaped binary supermassive black hole is there. The research paper was published in the Journal Nature Astronomy.

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