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Session 30 - Galaxy Evolution I.
Oral session, Monday, January 15
1st Floor, La Villita Assembly Building
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\approx 22,
J\approx 24 along with deep optical B,R and I images.
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. In the K< 20 sample the
median redshift is about 1.3 with a tail extending to redshift 3 as
is predicted by passively evolving galaxy models. 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 Program
listing for Monday
Program listing for Monday