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ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole 5nvklj





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ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole

Dragon
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Post by Dragon Sat Sep 25, 2021 1:38 am

Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) have found thousands of dense gas clumps but, surprisingly, no star formation, in a circumnuclear disk around Sagittarius A*, the 4-million-solar-mass black hole at the center of our Milky Way Galaxy.

Every large galaxy has a central supermassive black hole that dominates and is fed by nearby molecular gas.

Since molecular gas is the material that supplies black holes and forms stars, Dr. Pei-Ying Hsieh and colleagues wanted to know how much gas is available to form stars and how much is going to feed the supermassive black hole.


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ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole 334pu7m
Dragon
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Post by Dragon Sat Sep 25, 2021 1:40 am

ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole Image_10073_1-Milky-Way-Circumnuclear-Disk
Image credit: Hsieh et al. / ALMA / EOS / NAOJ / NRAO.

Clumps of molecular gas overlaid on Sagittarius A* circumnuclear disk as seen by ALMA in the CS(7-6) line.

Yellow circles are thin clumps that are going to be shredded by the gravitational force of supermassive black hole Sagittarius A*.

Green circles are dense enough to survive the tidal shredding but are not able to form stars. Purple/pink circles have the needed density to form stars, but no star formation has been observed.


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ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole 334pu7m
Dragon
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Posts : 7263
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ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole Empty Re: ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole

Post by Dragon Sat Sep 25, 2021 1:42 am

ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole Image_10073_2-Milky-Way-Circumnuclear-Disk
Image credit: Dong et al. / NASA / ESA / Hubble / Hsieh et al. / N. Lira / ALMA / EOS / NAOJ / NRAO.

This composite image shows hot ionized gas (red) captured by Hubble and much colder molecular gas (blue and purple) captured by ALMA around Sagittarius A*’s circumnuclear disk.


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ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole 334pu7m
Dragon
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Posts : 7263
Points : 23847
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ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole Empty Re: ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole

Post by Dragon Sat Sep 25, 2021 1:44 am



A Tour of the Sagittarius A* Black Hole Swarm

Astronomers have discovered evidence for thousands of black holes located near the center of our Milky Way galaxy using data from NASA's Chandra X-ray Observatory.

This black hole bounty consists of stellar-mass black holes, which typically weigh between five to 30 times the mass of the Sun. These newly identified black holes were found within three light years — a relatively short distance on cosmic scales — of the supermassive black hole at our Galaxy's center known as Sagittarius A* (Sgr A*).

A black hole by itself is invisible. However, a black hole — or neutron star — locked in close orbit with a star will pull gas from its companion.

Astronomers call these systems "X-ray binaries".

This material falls into a disk and heats up to millions of degrees and produces X-rays before disappearing into the black hole.

Some of these X-ray binaries appear as point-like sources in the Chandra image.


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ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole 334pu7m

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