Galaxy transformation by Environment

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Galaxy transformation by Environment

  1. 1. Galaxy Clusters and the Butcher-OemlerEffect: Galaxy Transformation by Environment Emily Cross and Kristine Salters
  2. 2. “Like cities, each cluster has unique characteristics and population demographics: Coma, Virgo, and the Local Group are as different from each other as Toronto, Bangkok, and Rio de Janeiro” (S&T: January 1988, page 16).
  3. 3. Galaxy cluster with high redshift have a  higher blue star forming spiral population Low redshift, low blue spiral population 
  4. 4. RED SHIFT
  5. 5. Infalling spiral galaxy Galaxy cluster
  6. 6. Merging  Starburst  The youths Ram pressure stripping  Tidal disruption  SF completely exhausted
  7. 7. We had never seen the phase between the  young blue spirals and the old red ellipticals until November of 2008
  8. 8. Photo 
  9. 9. The evolving properties of galaxies in clusters offer a unique opportunity to connect evolution on scales ranging from individual galaxies to overall cosmic evolution

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