Bibcode
López-Sanjuan, C.; Balcells, M.; Pérez-González, Pablo G.; Barro, Guillermo; García-Dabó, C. E.; Gallego, Jesús; Zamorano, Jaime
Bibliographical reference
Stellar Populations – Planning for the Next Decade, Proceedings of the International Astronomical Union, IAU Symposium, Volume 262, p. 209-212
Advertised on:
4
2010
Citations
0
Refereed citations
0
Description
We study the evolution of the red sequence and the blue cloud since z ~
1 to present in GOODS-S field for MB ≤ -20 and
M* ≥ 1010 M&sun; selected galaxies.
We segregate the galaxies in early-type galaxies (ET, E/S0/Sa), and
late-type galaxies (LT, Sb-Irr) by their position in the
concentration-asymmetry plane, while in passive and star-forming by
their rest-frame NUV - R color and their 24μm properties.
We find that red sequence (passive early types) comoving number density
rise with cosmic time in both samples, while blue cloud (star-forming
late types) number density descent in luminosity-selected samples and
increase in mass-selected sample. We also find a third population that
comprises star-forming early-type galaxies.
Comparing the observed evolution with the disk-disk (wet) major merger
rate in GOODS-S, we infer that only ~20% of M* ≥
1010 M&sun; red sequence galaxies appeared since z
= 1 can be explained by this kind of mergers, suggesting that minor
mergers and secular evolution are the main processes in the red sequence
evolution of M* ≥ 1010 M&sun;
galaxies since z ~ 1.