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Twelve Ultra-Diffuse Galaxies in Hydra I Cluster 5nvklj





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Twelve Ultra-Diffuse Galaxies in Hydra I Cluster

Dragon
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Post by Dragon Thu Jun 03, 2021 3:13 am

Astronomers using ESO’s VLT Survey Telescope, a 2.6-m wide-field optical survey telescope at Paranal Observatory in Chile, have discovered 27 low-surface brightness galaxies — of which 12 are candidates for ultra-diffuse galaxies — in a large group of galaxies called the Hydra I cluster.

Ultra-diffuse galaxies are objects as large as the Milky Way but with 100-1,000 times fewer stars.

Discovered in 2015, these galaxies are extremely faint and lack star-forming gas, which makes them appear almost like a fluffy cosmic cloud.

Their origins remain uncertain, but astronomers speculate that they could be ‘failed’ galaxies that lost their gas supply early in their lifetimes.


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Dragon
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Post by Dragon Thu Jun 03, 2021 3:14 am

Twelve Ultra-Diffuse Galaxies in Hydra I Cluster Image_9715_1-Hydra-I-Cluster
Image credit: Iodice et al., doi: 10.1051/0004-6361/202038523.

VST mosaic of the Hydra I: NGC 3311 and NGC 3309 are the two brightest cluster galaxies located close to the image center; the 27 low-surface brightness galaxies are marked as white circles; cyan squares show the 12 ultra-diffuse galaxies.


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Post by Dragon Thu Jun 03, 2021 3:15 am



Hydra A galaxy cluster shows 10-million-degree gas observed by Chandra and jets of radio emission observed by the Very Large Array.


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