Group Living Takes a Toll on Galaxies

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While a green haze of hydrogen gas permeates some of the galaxies in this Hickson Compact Group others such as the spiral galaxy on the left have little to no gas associated with them. This false color image was obtained using the Very Large Array an ...
While a green haze of hydrogen gas permeates some of the galaxies in this Hickson Compact Group, others, such as the spiral galaxy on the left, have little to no gas associated with them. This false color image was obtained using the Very Large Array and the Digitized Sky Survey 2. Image credit: Min Yun, University of Massachusetts Amherst

Astronomers have detected substantial amounts of filamentary, cold gas in compact groups of galaxies, highlighting what may be an important force in galactic evolution, scientists announced today at the American Astronomical Society meeting in Calgary, Alberta. The findings also raise the intriguing possibility that more matter than previously thought may be tied up in these galaxy groups, captured in the lattice of the cosmic web.


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