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Astronomers Discover New Dark-Matter-Free Galaxy

Dragon
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Astronomers Discover New Dark-Matter-Free Galaxy Empty Astronomers Discover New Dark-Matter-Free Galaxy

Post by Dragon Wed Dec 15, 2021 3:26 am

Astronomers from the Netherlands, the United Kingdom and the United States have found no trace of dark matter in AGC 114905, a gas-rich ultra-diffuse galaxy approximately 248 million light-years from Earth.

AGC 114905 is located about 76 megaparsecs (248 million light-years) away in the constellation of Pisces.

It is classified as an ultra-diffuse dwarf galaxy, with the name ‘dwarf galaxy’ referring to its luminosity and not to its size.

AGC 114905 is about the size of our own Milky Way Galaxy but contains a thousand times fewer stars.


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Dragon
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Post by Dragon Wed Dec 15, 2021 3:28 am

Astronomers Discover New Dark-Matter-Free Galaxy Image_10342-AGC-114905
Image credit: Javier Román / Pavel Mancera Piña.

This image shows the gas-rich ultra-diffuse galaxy AGC 114905; the stellar emission is shown in blue; the green clouds show the neutral hydrogen gas.


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Post by Dragon Wed Dec 15, 2021 3:29 am



A galaxy missing all of its dark matter baffles scientists.

theory predicts that sparse galaxies have to be held together by dark matter.

Observations of the diffuse galaxy AGC 114905 suggest the galaxy has no dark matter.

The finding defies theories.

Astronomers are wondering what holds together a distant galaxy that appears to contain no trace of dark matter.


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