Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-02
Astronomy and Astrophysics
Astrophysics
4 pages, Invited Review Talk for IAU Symposium 235, Galaxies Across the Hubble Time, J. Palous & F. Combes, eds. Uses iaus.cls
Scientific paper
I discuss current observational constraints on the star-formation and stellar-assembly histories of galaxies at high redshifts. The data on massive galaxies at z<1 implies that their stellar populations formed at z>2, and that their morphological configuration was in place soon thereafter. Spitzer Space Telescope 24 micron observations indicate that a substantial fraction of massive galaxies at z ~ 1.5-3 have high IR luminosities, suggesting they are rapidly forming stars, accreting material onto supermassive black holes, or both. I compare how observations of these IR-active phases in the histories of massive galaxies constrain current galaxy-formation models.
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