Finding a Galaxy where the DM has been siphoned away.

Discussion in 'Astronomy, Exobiology, & Cosmology' started by paddoboy, Dec 2, 2020.

  1. paddoboy Valued Senior Member

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    https://www.universetoday.com/14901...alaxy-that-had-its-dark-matter-siphoned-away/

    Astronomers find a galaxy that had its dark matter siphoned away
    The galaxy NGC 1052-DF4 surprised scientists by having almost no dark matter to complement its stellar population. Recently a team of astronomers has provided an explanation: a nearby galaxy has stripped NGC 1052-DF4 of its dark matter, and is currently in the process of destroying the rest of it too.

    Despite its complete invisibility, dark matter is the fundamental building block of just about everything big in the universe. When you look at a galaxy, you see all the stars and blobs of glowing gas, but all that visible matter makes up less than 15% of the total mass of the galaxy. The rest is distributed in a large “halo” of dark matter. We don’t know what the dark matter is, but it’s a big deal.

    This had been the normal pattern until the discovery of the galaxy NGC 1052-DF4 in 2015. That galaxy, sitting about 45 million light-years away, has almost no dark matter.

    This was a big puzzle, because galaxies need halos of dark matter to even begin forming, so how could all those stars and gas bind together without a dark side?

    A team of astronomers have used a combination of ground-based observations and the Hubble Space Telescope to examine NGC 1052-DF4 in more detail, especially looking at globular clusters. Globular clusters are small, dense clumps of that orbit a galaxy (the Milky Way has over 150 of
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  3. Write4U Valued Senior Member

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    Astronomers find a galaxy that had its dark matter siphoned away

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    https://www.universetoday.com/14901...alaxy-that-had-its-dark-matter-siphoned-away/

    After watching this interesting video by Sabine Hossenfelder, where she explains that Dark Matter is unevenly distributed throughout the universe. Apparently Dark Matter can be condensed (greater mass) or expanded (lesser mass) which affects the overall gravitational forces in different areas of the universe.


    A simple question came to mind about the causes for expansion and condensing of fields; Temperature!

    Can certain galaxies be hotter than others and its Dark Matter is expanded and has less mass than colder galaxies?

    Perhaps the Dark Matter has not been siphoned away but was expanded away?
    Can this be measured?
     
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