Mathematics – Logic
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8269e&link_type=abstract
HST Proposal ID #8269
Mathematics
Logic
Hst Proposal Id #8269 Distant Galaxies
Scientific paper
We propose to use WPC2 to study the morphological evolution of a near-IR selected sample of field galaxies with redshifts between 1 and 2. This range of redshifts is of particular interest since it seems that the properties of field galaxies changes dramatically at 1 < z < 2. Luminous spirals and early type galaxies appear to slowly evolve from z 1 to the present but a luminous and rapidly star forming population emerges by z>2. Determining how these two seemingly disparate populations are related is the goal of this proposal, in which we will study how the morphology, bulge, and disk properties of normal luminous field galaxies change from z 2 to z 1. Given the space density and luminosity of L_* galaxies we must survey a large area to provide a statistically significant sample of galaxies. Our sample is complete to K < 20 {drawn from imaging down to K 21.4 at 3Sigma to ensure completeness}, and covers roughly 100 arcmin^2, ensuring we have several hundred galaxies m ore luminous than L_* with 1 < z < 2. Near-IR selection is very well suited for the study of galaxy evolution since the near-IR k-corrections are small, uniform over galaxy types and rather immune to evolution of the stellar population. Thus, the galaxy type mix will be the same for all redshifts, and ensures that the galaxy sample is not biased toward finding more actively evolving populations.
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