Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7974s&link_type=abstract
HST Proposal ID #7974
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #7974 Extragalactic Astrophysics
Scientific paper
HST studies of early-type galaxies in z < 0.9 clusters indicate that the ellipticals form a coeval population, which has existed largely unchanged since z ~ 3, except for the effects of predominately passive evolution. In comparison, the S0 and later type galaxies have a more complex star formation history. One of the most useful diagnostics in such studies is the intrinsic scatter in the optical--IR colors, which can place strong limits on the amount of star formation at prior epochs. The single burst+passive-evolution galaxy formation model predicts small intrinsic scatter at z < 2 for high z_f. Hierarchical galaxy formation models, based on the cold dark matter theory of structure formation, predict a large amount of recent merging, which should lead to starbursts and relatively large color scatter in elliptical galaxies at 1 < z < 2. In order to better test the predictions of different galaxy formation models for the evolution of the intrinsic color scatter of cluster ellipticals, we need to examine clusters at higher redshift. We propose to use Archival WFPC2 imaging of 7 clusters at 0.8 < z < 1.2 to morphologically-select cluster ellipticals. We will then use our ground-based optical-IR imaging to measure the intrinsic color scatter of these samples, as well as to determine the slope and zeropoint of the color-magnitude relation.
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