The CFHT Legacy Survey: The Morphology-Density Relation of Galaxies out to Z~1

Details The CFHT Legacy Survey: The Morphology-Density Relation of Galaxies out to Z~1 The CFHT Legacy Survey: The Morphology-Density Relation of Galaxies out to Z~1

2005-05-06

arxiv.org/abs/astro-ph/0505123v1

Astrophys.J. 626 (2005) L77-L80

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ

Scientific paper

10.1086/431755

We study the relationships between galaxy total luminosity (M_g), morphology, color and environment as a function of redshift. We use a magnitude-limited sample of 65,624 galaxies in the redshift range 02 number fractions at z=0.1 agree well with those based on SDSS galaxies. We find that the n>2 galaxy number fraction is constant with redshift in the field. However, for overdense environments this fraction is larger and increases towards lower redshifts, higher densities and higher luminosities. Rest-frame color-magnitude diagrams show that the color distribution is bimodal out to our redshift limit of z~1 with a prominent red-sequence of galaxies at 0.21). For all environments, this fraction increases towards lower redshifts and higher luminosities. The red fraction within cluster-like regions changes 60% faster with redshift as compared to the field for M_g<-19.5. Using, for the first time, observations across many cluster-field interfaces distributed over a single, large volume, we trace the large-scale morphology-density relation and the Butcher-Oemler effect over a period of almost 8 Gyr.

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