Galaxy Evolution: Internally or Externally Driven?

Details Galaxy Evolution: Internally or Externally Driven? Galaxy Evolution: Internally or Externally Driven?

2002-07-17

arxiv.org/abs/astro-ph/0207358v1

Astronomy and Astrophysics

Astrophysics

2 pages, Cozumel conference proceedings; to appear in `Galaxy Evolution: Theory and Observations' Eds. V. Avila-Reese, C. Firm

Scientific paper

The globally-averaged star formation rate in the Universe has been steadily declining since at least z~1. This may be due either to very local processes operating within the average galaxy, or to external, environmental effects. Specifically, the build-up of structure may be responsible for terminating star formation in some galaxies and thus decreasing the global average. We summarize our previous and ongoing work to distinguish between these possibilities, by determining the average star formation rate as a function of redshift and environment, out to z=0.5.

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