Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8767i&link_type=abstract
HST Proposal ID #8767
Mathematics
Logic
Hst Proposal Id #8767 Cosmology
Scientific paper
The evolution of field E/S0 galaxies, especially their number density, is in debate. Theoretical models based on hierarchical structure formation predict that a significant fraction of present day E/S0's are formed at z < 1 via merging. This is in sharp contrast to the so-called ``monolithic collapse'' model which predicts the coeval formation of E/S0's at high redshift {z >> 1}. Current observational constraints on the evolution of field E/S0's are controversial, mainly because of the lack of a sample large enough to provide statistically significant limits. From the HST Archive, we have identified 230 WFPC2 fields at high Galactic latitude which have V and I imaging of sufficient depth for morphological identification of E/S0's to I = 22. In these fields, we estimate that there will be 1200-1400 normal, luminous, field E/S0's with I < 22, z < 1 and z_med 0.5, enough to provide significant improvement in the number statistics over previous studies. This large sample of E/S0 galaxies will constrain : i} the number density evolution of field E/S0's at z < 1 to an accuracy of better than 10 ii} the luminosity evolution of field E/S0's since z=1; and iii} the cosmological parameters. Knowing the number density should settle whether merging since z=1 can have been a major process in the formation of E/S0's.
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