Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth

Details Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth

2007-05-19

arxiv.org/abs/0705.2831v2

Astrophys.J.670:156-172,2007

Astronomy and Astrophysics

Astrophysics

19 pages, 18 figures. ApJ in press. A figure added. See also the companion paper arXiv:0705.2832

Scientific paper

10.1086/521818

Examining a sample of massive galaxies at 1.410^{11}L_sun, show a mid-IR excess which is likely due to the presence of obscured active nuclei, as shown in a companion paper. There is a tight and roughly linear correlation between stellar mass and SFR for 24um-detected galaxies. For a given mass, the SFR at z=2 was larger by a factor of ~4 and ~30 relative to that in star forming galaxies at z=1 and z=0, respectively. Typical ultraluminous infrared galaxies (ULIRGs) at z=2 are relatively 'transparent' to ultraviolet light, and their activity is long lived (~400 Myr), unlike that in local ULIRGs and high redshift submillimeter-selected galaxies. ULIRGs are the common mode of star formation in massive galaxies at z=2, and the high duty cycle suggests that major mergers are not the dominant trigger for this activity.Current galaxy formation models underpredict the normalization of the mass-SFR correlation by about a factor of 4, and the space density of ULIRGs by an orderof magnitude, but give better agreement for z>1.4 quiescent galaxies.

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