Plenty of Examples That Giant Galaxies Like the Milky Way Formed Through Mergers

The Milky Way is but one of billions.
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fred8615
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Joined: October 12th, 2009, 12:29 pm
Location: Sorrento, LA

Plenty of Examples That Giant Galaxies Like the Milky Way Formed Through Mergers

Post by fred8615 »

The Universe’s giant galaxies pose a thorny problem for astronomers. The galaxies have grown large somehow, and the only things that can make a galaxy giant are probably other galaxies. So mergers must have played an important role.

Astronomers have known about galaxy mergers for a long time, but the process is still mysterious. A new study based on ten years of work presents observations and direct measurements of the galaxy merger process that remove some of the mystery.

It seems axiomatic that galaxies grow large by merging with other galaxies. Where else could they acquire so much mass? Galaxies are the largest, most massive, distinct structures in the Universe. Galaxy clusters and groups are larger, but they’re collective structures made of distinct, individual galaxies that are associated but not interacting. For a giant galaxy like our Milky Way—or our even larger neighbour, the Andromeda Galaxy—to grow so massive, it had to acquire large amounts of mass. And the only available sources of large-scale mass are other galaxies.

Galaxy formation is an active area of study in cosmology, and the theoretical work on galaxy mergers is substantial. But observations and detailed conclusions have lagged behind.

Read more: https://www.universetoday.com/156310/pl ... h-mergers/
Frederick J. Barnett
"Someone's got to take the responsibility if the job's going to get done!! Do you think that's easy?!" Gregory Peck - The Guns Of Navarone
Jeremy123
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Joined: July 22nd, 2022, 1:17 am

Re: Plenty of Examples That Giant Galaxies Like the Milky Way Formed Through Mergers

Post by Jeremy123 »

Nice examples, thank you. updated blog post
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