Some supermassive black holes express their presence with circulating heat discs from circulating gas. But the giant in the center of the Milky Way was shy and quiet. Now astronomers have finally seen the light bleshtyashtiya accretion plate from a black hole from falling material, which has long been suspected but never seen before.
“I was very surprised that we really saw it,” said astrophysicist Elena Marchza of the Advanced Institute in Princeton, New Jersey. Nature June 6.
The supermassive black hole of the Milky Way, called Sagittarius A *, is a giant with 4 million solar masses. But while some black holes swallow gas and dust around them, Sgr. A * elegant. Nutritious “black holes” like that “don’t have enough food” so that their gases shine brightly, said Mercikova.
Reduced plate brightness explains why researchers using the Event Horizon Telescope managed to capture images of central black holes in distant galaxies managed by M87, but not yet Sgr A * (SN: 4/27/19, p. 6)
Previously, scientists saw hot gas clouds (about 10 million degrees Kelvin) emitting high-energy X-rays around Sgr A * when stars and gas clouds orbit black holes. However, this source of gas does not appear to be regulated on a disk that is orbiting clean. Merchikova and colleagues focus on searching around 10,000 Kelvin cooling gases, located within a radius of around 280 billion kilometers around Sgr A *. Just looking at the hot gas is like trying to study Earth’s climate by focusing on summer in the wilderness. “Gas from both species must fall into a black hole,” Mercikova said. “You need a complete picture.
ALMA measures cooler gas by observing light particles at certain wavelengths. These photons are emitted when electrons and protons in the gas combine to form hydrogen atoms. When Marchikova and her colleagues looked at the distribution of photons around a black hole, he saw an oval disc gap in the middle where the black hole was located.
On one side of the disk, wavelengths of light are stretched or red. On the other hand, the light is broken or bluish. This finding means that one side of the disc moves to the ground and the other to the ground – a clear sign that the disc is spinning.
“I never thought I could see organized rotation,” said Mercikova.
The team also estimated disk mass – between 0.00001 and 0.0001 times the mass of the sun, depending on how thick the disk is. And the researchers calculated how much matter falls into the black hole, what they say is around 2.7-10-10 solar masses per year, or about half the mass of the dwarf planet Ceres.
“I think this is very exciting,” said UCLA astrosurist Anna Uuro, who was not involved in the new work. His team used the Keck telescope in Hawaii to look for dishes with infrared wavelengths, but found nothing.
If disc activity is seen by ALMA, but not by Keck, this “makes us believe that there are some more specific procedures that are not fully understood,” Ciurlo said. Further observations with ALMA and the Event Horizon telescope can help solve the puzzle.