%0 Journal Article
%T The Colour-Magnitude Relation of Early-Type Galaxies in the Hubble Deep Field
%A Tadayuki Kodama
%A Richard G. Bower
%A Eric F. Bell
%J Physics
%D 1998
%I arXiv
%R 10.1023/A:1017520213745
%X We present the rest-frame colour-magnitude diagram for 35 early-type galaxies in the Hubble Deep Field with median redshift 0.9. Although with considerable scatter, a red sequence well-described by the passive evolution of an intrinsically old stellar population is observed. Comparison with the passively evolved colour-magnitude relation of the rich Coma cluster ($z=0.023$) indicates that around half of the early-type galaxies in the field at this redshift are as old as those in rich clusters.
%U http://arxiv.org/abs/astro-ph/9810138v1