INVESTIGADORES
O'MILL Ana Laura
artículos
Título:
The evolution of the bi-modal colour distribution of galaxies in SDSS groups
Autor/es:
MARTINEZ, HECTOR JULIAN; O´MILL, ANA LAURA; DIEGO G. LAMBAS
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2006 vol. 372 p. 253 - 258
ISSN:
0035-8711
Resumen:
We analyse $u-r$ colour distributions for several samples of galaxies in groups drawn from the Fourth Data Release of the Sloan Digital Sky Survey. For all luminosity ranges and environments considered the colour distributions are well described by the sum of two Gaussian functions. We find that the fraction of galaxies in the red sequence is an increasing function of group virial mass. We also study the evolution of the galaxy colour distributions at low redshift, $zle0.18$ in the field and in groups for galaxies brighter than $M_r-5log(h)=-20$, finding significant evidence of recent evolution in the population of galaxies in groups. The fraction of red galaxies monotonically increases with decreasing redshift, this effect implies a much stronger evolution of galaxies in groups than in the field.
