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Galactic Census Reveals Origin of Most “Extreme” Galaxies

15 Sep 2020, 22:42 UTC
Galactic Census Reveals Origin of Most “Extreme” Galaxies
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IMAGE: A wide field view of the central region of the Virgo Cluster, measuring 4.4 million light years on each side, from the Sloan Digital Sky Survey. Some of Virgo’s brightest member galaxies are labeled, including Messier 87, or M87, which is located close to the cluster center. Insets show deep images of two structurally extreme galaxies, taken with the MegaCam instrument on CFHT as part of the Next Generation Virgo Cluster Survey. An ultra-compact dwarf is within the crosshairs in the lower inset, while an ultra-diffuse galaxy is featured in the upper inset. These galaxies are nearly a thousand times fainter than the bright galaxies visible on this image. Although the compact and diffuse galaxies contain roughly the same number of stars, and their total brightness is similar, they differ in area by a factor of more than 20,000. The scale bars in each inset represent a distance of 10,000 light years. CREDIT: Sloan Digital Sky Survey, Canada-France-Hawaii Telescope and the NGVS team.

Galaxy clusters are a common target for telescopes. They are stunningly beautiful, they host a whole lot of objects in a very small region of the sky, and they, unlike star clusters, contain a myriad of ...

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