Stellar Populations and Morphology at High Redshift

Andrew Bunker 
Institute of Astronomy, Cambridge

In this talk, I will describe recent work on the
colours and morphology of galaxies, using the optical
and near-IR imaging by HST of the northern Hubble Deep
Field. The goal is to compare galaxy appearance at the 
same rest-wavelengths to determine whether the apparent
increase in irregular galaxies at faint magnitudes in
the optical is in fact a band-shifting effect, with
high-redshift galaxies viewed in their unfamiliar rest-UV
(see astro-ph/0004348).

I will go on to discuss the use of spatially-resolved
colours to study different stellar populations within
galaxies. I will describe how this technique has been
applied to a z=4 gravitationally-lensed star forming galaxy
(Bunker, Moustakas & Davis 2000 ApJ 531, 95).