A comparison of a young (top) and old (bottom) galaxy observed as part of the SAMI Galaxy Survey (IMAGE)

ARC Centre of Excellence for All Sky Astrophysics in 3D (ASTRO 3D)

A comparison of a young (top) and old (bottom) galaxy observed as part of the SAMI Galaxy Survey

Caption

A comparison of a young (top) and old (bottom) galaxy observed as part of the SAMI Galaxy Survey. Panels on the left are regular optical images from the Subaru Telescope. In the middle are rotational velocity maps (blue coming towards us, red going away from us) from SAMI. On the right are maps measuring random velocities (redder colours for greater random velocity). Both galaxies have the same total mass. The top galaxy has an average age of 2 billion years, high rotation and low random motion. The bottom galaxy has an average age of 12.5 billion years, slower rotation and much larger random motion.

Credit

Subaru credit: Image from the Hyper Suprime-Cam Subaru Strategic Program

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