Astronomers Begin to Understand Strange 'Backsplash' Galaxies - by PaulMattSutter
a series of clusters with data taken from the Sloan Digital Sky Survey. They used the velocities of galaxies inside those clusters to separate them into in-falling galaxies and backsplash galaxies.
They found that backsplash galaxies were consistently older, meaning that they had a lower fraction of young stars inside them. The backsplash galaxies also tended to be quieter in terms of overall seller activity than their in-falling cousins. The astronomers behind the study hypothesize that when backsplash galaxies first encounter the dense environments of the inner cluster, this ramps up star production inside the galaxies. This eats up a lot of usable gas to make future generations of stars, and so when galaxies climb their way back out to the other side of the cluster they have less fuel and so make stars at a far slower pace.
Further understanding the relationship between in-falling and backsplash galaxies will help astronomers piece together the
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