Study: Milky Way’s enormous Black Hole has a cloud of gas encircling it
According to a new study published in Nature, astrophysicist Elena Murchikova of Princeton University, they were the first to image this elusive disk and study its rotation.
Cosmologists looking closely into dark heart of the Milky Way galaxy have glimpsed an extensive rotating disc of a cool gas which encircles an enormous black hole. For a long time, this disc has been hypothesised. But, now, it is disclosed in all its tempestuous prestige.
The supermassive black holes at the core of most galaxies had numerous sort of galactic nuclei. Some of them conflagrate brightly billions of light-years, as they gulp gas and emit electromagnetic radiation into space. A few like the Milky Way’s core Sagittarius A*, an enormous black hole topping the lamella at 4 million times the mass of the Sun, which are much silent.
Nonetheless that doesn’t mean the province surrounding it is silent and calm because we know that Sgr A* is of leisurely pace accreting material from the space around it. That material around it is probably billowing as an accretion disc like water circling a channel.
Till now, however, cosmologist only got a glance of the glowing hot portion of it, which is a roughly spherical flow of that because of frictional forces, eject out an X-ray glow at a temperature of 10 million Kelvin approximately. But, it doesn’t show clear indication of rotation, nor we expect that it has the flattened disc.
But beyond this hot gas in the space, a radius of approx. 6.5 light-years from the black hole is stretching out. From another telescopes, they have became aware of a cooler region of hydrogen gas.
However, the part this gas preformed in the accretion process was unsure. But, the radiation from the black hole is constantly ionising the gas which cause the hydrogen atoms to lose and regain their electrons. This gives off a faint radio signal that astronomers were able to detect using the Atacama Large Millimetre/submillimetre Array (ALMA) in Chile.
Than, they compiled radio signal into an image, that clearly showed the disc’s rotation. These radio signal also permitted the team to measure the density and the mass of the gas in this region, which very slightly between 0.0001 and 0.00001 times the mass of the Sun, and spread across light-years of space. This means that Sgr A* is literally a small eater.
According to these curbs, every year over the half mass of the dwarf planet Ceres of cool hydrogen gas is drop into the black hole.
In inclusion Murchikova said that this is our closest supermassive black hole. Even so, they still have no good understanding of how its accretion works. They hope that these new ALMA observations will help the black hole give up some of its secrets.