The role of the LIRG and ULIRG phases in the evolution of Ks-selected galaxies

Details The role of the LIRG and ULIRG phases in the evolution of Ks-selected galaxies The role of the LIRG and ULIRG phases in the evolution of Ks-selected galaxies

2006-04-11

arxiv.org/abs/astro-ph/0604232v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A. 9 pages, 6 figures

Scientific paper

10.1051/0004-6361:20054553

We investigate the role of the luminous infrared galaxy (LIRG) and ultra-luminous infrared galaxy (ULIRG) phases in the evolution of Ks-selected galaxies and, in particular, Extremely Red Galaxies (ERGs). With this aim, we compare the properties of a sample of 2905 Ks<21.5 (Vega mag) galaxies in the GOODS/CDFS with the sub-sample of those 696 sources which are detected at 24 microns. We find that LIRGs constitute 30% of the galaxies with stellar mass M>1x10^{11} Msun assembled at redshift z=0.5. A minimum of 65% of the galaxies with M>2.5x10^{11} Msun at z~2-3 are ULIRGs at those redshifts. 60% of the ULIRGs in our sample have the characteristic colours of ERGs. Conversely, 40% of the ERGs with stellar mass M>1.3x10^{11} Msun at 1.51x10^{11} Msun) galaxies present in the Universe at a given time, this fraction becomes very significant (>50%) at redshifts z>~2.

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