Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.7806d&link_type=abstract
American Astronomical Society, AAS Meeting #211, #78.06; Bulletin of the American Astronomical Society, Vol. 39, p.869
Other
Scientific paper
Analyses of the evolution of the Red Sequence (RS) of galaxy clusters have shown that the bulk of the stars in red early-type galaxies have formed at redshift as high as z=3. For galaxy clusters at z 0.8-1.3 this corresponds to stellar ages > 3 Gyr. By combining multi-band HST/ACS imaging and VLT/FORS spectroscopy on two of the most distant clusters of galaxies known in the southern sky, one at z=0.84 and another at z=1.24, we are able to probe the stellar populations of galaxies in the RS of these clusters. The co-added spectrum of galaxies on the RS of the z=0.84 cluster reveal, through the presence of Balmer absorption features, the existence of younger stellar populations. In a given cluster, the strength of these Balmer features depends on both color and luminosity, in the sense that blue, faint RS galaxies display stronger Balmer lines. Taking metallicity effects into account, this will provide information on the age differences between the stellar populations of RS galaxies and the effect of these age differences on the slope and scatter of the Color Magnitude Relation. Finally, the combined spectrum of the brightest RS galaxies in the z=1.24 cluster shows evidence for an increased Balmer line strength with respect to the brightest RS galaxies of the z=0.84 cluster. This suggests that the z=1.24 cluster is near to an epoch during which the star-forming activity in the most massive galaxies is more important than that at redshift z < 1, where the most massive galaxies are passively evolving.
Demarco Ricardo
Ford Holland
Rettura Alessandro
Rosati Piero
van der Wel Arjen
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