The Evolution of the Blue Galaxy Fraction in DEEP2 Groups and Isolated Galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Groups and clusters of galaxies, as the largest, most recently formed objects in the universe, carry much information about the recent history of the cosmos. By studying these systems at a variety of epochs, it is possible to reconstruct the evolution of clusters and their luminous contents, providing important constraints on theories of galaxy formation. With the recent completion of the DEEP2 Galaxy Redshift Survey at z 1, it is now possible to perform detailed studies of galaxy groups and clusters over a wider redshift range than ever before. In this talk I will present recent results suggesting that, at the DEEP2 epoch, galaxy groups had only recently become suitable environments for shutting off star formation in galaxies. I will comment on the implications of this result for models of galaxy formation.

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