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Results on Galaxy Evolution from the CNOC2 Field Galaxy Redshift Survey

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arxiv astro-ph/9712244 v1 pith:MXPAXMBT submitted 1997-12-18 astro-ph

classification astro-ph
keywords galaxyevolutionredshifttypescnoc2densityearlyfield
verification ladder T0 review T1 audit T2 compute T3 formal
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The CNOC2 Field Galaxy Redshift Survey presently contains some 5000 galaxy redshifts, plus extensive UBgRI photometry, and is the largest galaxy sample at moderate redshifts 0.1 < z < 0.6. Here we present some preliminary results on the galaxy luminosity function (LF) and its redshift evolution, using a sample of R < 21.5 CNOC2 galaxies, subdivided into early, intermediate, and late types based on their B-R colors relative to non-evolving galaxy models. We find a significant steepening in the faint-end slope alpha of the LF as one proceeds from early to late types. Also, for all galaxy types we find a rate of M* evolution consistent with that from passively evolving galaxy models. Finally, late-type galaxies show positive density evolution with redshift, in contrast to negative or no density evolution for earlier types.

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