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Red, Dead (and Flat?) Galaxies in Distant Clusters

13 Aug 2021, 16:00 UTC
Red, Dead (and Flat?) Galaxies in Distant Clusters
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Editor’s note: Astrobites is a graduate-student-run organization that digests astrophysical literature for undergraduate students. As part of the partnership between the AAS and astrobites, we occasionally repost astrobites content here at AAS Nova. We hope you enjoy this post from astrobites; the original can be viewed at astrobites.org.
Title: The GOGREEN Survey: Evidence of an excess of quiescent disks in clusters at 1.0 < z < 1.4
Authors: Jeffrey C.C. Chan et al.
First Author’s Institution: University of California, Riverside
Status: Accepted to ApJ

Galaxies in our universe can generally be separated into two categories. First, we have beautiful, intricate spiral galaxies, the galaxies that astronomers want you to see. These galaxies have flat, disky shapes (like a dinner plate), delicate spiral arms, and rich supplies of gas, meaning that they are in the process of forming new stars (which gives them a blue colour). On the other hand, we have elliptical galaxies. These less-glamorous cousins of star-forming spirals have a spheroidal, featureless shape and are typically “quiescent”, meaning that they contain very little gas and therefore exhibit very little star formation (which makes them appear red). Nevertheless, studying them still leads to exciting discoveries…
One of the most important ...

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