Why is there long red streak attached to this galaxy? The streak is made mostly of
glowing hydrogen that has been systematically stripped away as the galaxy moved through the ambient hot gas in a cluster of galaxies. Specifically, the galaxy is
spiral galaxy D100, and cluster is the
Coma Cluster of galaxies. The red path connects to the center of D100 because the outer gas, gravitationally held less strongly, has already been
stripped away by
ram pressure. The extended gas tail is about 200,000
light-years long, contains about 400,000 times the mass of
our Sun, and stars are forming within it. Galaxy D99, visible to D100's lower left, appears red because it glows primarily from the light of
old red stars -- young blue stars can no longer form because D99 has been
stripped of its star-forming gas. The featured false-color picture is a digitally enhanced composite of images from Earth-orbiting
Hubble and the ground-based
Subaru telescope.
Studying remarkable systems like this bolsters our understanding of how galaxies evolve in clusters. via NASA
Снимка на деня за January 28, 2019 от NASA
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