Wednesday, 22 November, 2017

Milky Way Black Hole Taking Huge Bite Out of Our Galaxy

Long-rumored midsized black hole may be hiding out in the Milky Way Supermassive black hole discovered near heart of the Milky Way
Garry Little | 05 September, 2017, 22:13

The existence of the new black hole was hinted at previous year, when a team from Keio University in Japan discovered the gas cloud, located just 200 light-years away from the centre of the Milky Way.

( team of researchers with Keio University in Japan has found evidence of a mid-sized black hole near the center of the Milky Way galaxy.

In this case, the presence of the black hole was given away by the unusually fast-moving gases surrounding it. Astronomers in Japan observed that the elements wafting around this particular cloud formation, which is a big gas behemoth 150 trillion kms. wide and is located about 200 light years from the heart of the Milky Way, were moving way quicker and at totally different speeds that those in similar clouds elsewhere in space.

The most likely cause, according to computer models, was a black hole no more than 1.4 trillion kilometres across.

Black holes are hard to spot because they don't emit any light of their own. This discovery shows that very young black holes grew more aggressively than previously thought, in tandem with the growth of their host galaxies. The team also has its eyes on several other compact molecular clouds that could harbor black holes. Gas in the cloud, detected with the National Astronomical Observatory of Japan's 45-meter Nobeyama radio telescope, was moving with a very wide range of velocities, some of it so fast that the team suspected something very massive was hiding there.

Alternatively, a supermassive black hole seed could come from a giant star, about 100 times the sun's mass, that ultimately forms into a black hole after it runs out of fuel and collapses. They also don't have the extreme conditions required to become a supermassive black hole. While the existence of such a black hole in our galaxy has nearly been settled, not the same can be said for other types of black holes. And for good reason - they're are mysterious, powerful things that can really make our place in the universe feel, well, very insignificant. Then they added Monday's find to the list of about 60 other known black hole "candidates".

It is widely accepted that black holes with masses greater than a million solar masses (M⊙) lurk at the centres of massive galaxies.

Recent research has shown supermassive black holes are essential to the creation of galaxies, stars - and even life itself.

Oka, whose research is published in the journal Nature Astronomy, said the newly-found black hole could be the core of an old dwarf galaxy that was cannibalised during the formation of the Milky Way billions of years ago.

Unusual movements of gas detected within CO-0.40-0.22 suggested some massive force was accelerating matter inside the cloud, which the researchers hypothesised was our best candidate yet for an intermediate-mass black hole.

"Further detection of such compact high-velocity features in various environments may increase the number of non-luminous black hole candidate and thereby increase targets to search for evidential proof of general relativity".


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