The Nature of Very Red Field Galaxies

Details The Nature of Very Red Field Galaxies The Nature of Very Red Field Galaxies

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6812e&link_type=abstract

HST Proposal ID #6812

Computer Science

Hst Proposal Id #6812 Cosmology

Scientific paper

Near-IR selection is ideal for the study of distant galaxy evolution because it minimizes bias toward finding strongly evolving or star forming galaxies. We have just completed a large area {100 arcmin^2} deep near-IR survey detecting galaxies to K 22. We have estimated ``photometric redshifts'' for a sample of galaxies with accurate photometry and K<20 to identify the progenitors of early type galaxies at z > 1 by searching for objects with very red colors. A particulary interesting indicator of z > 1.5 galaxies is the J-K color which should be greater than 2. We find about 3 such galaxies per arcminute, which is similar to the total number of early type {E,S0 and Sa} L^* galaxies expected between 1 1 it would appear that most early type galaxies are already well formed by a redshift greater than 2 but that they do begin to have a substantial UV excess at z > 1.5. However, our color selection could be fooled by a population of very dusty galaxies or a population of red AGN. We want to obtain deep WFPC2 images in the F814W filter to study the morphology of these very red galaxies to test if these very distant galaxies already have the morphology of early type galaxies and are thus the progenitors of current day early type galaxies or if they are a distinct new population. If they are early type galaxies, we will use the Kormendy r_e-Mu_e relation to constrain their evolution and confirm their photometric redshifts.

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