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





ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole 9tpt39

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

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

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

    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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    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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    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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