The rest-frame optical luminosity functions of galaxies at 2<z<3.5

Details The rest-frame optical luminosity functions of galaxies at 2<z<3.5 The rest-frame optical luminosity functions of galaxies at 2<z<3.5

2006-10-16

arxiv.org/abs/astro-ph/0610484v2

Astrophys.J.656:42-65,2007

Astronomy and Astrophysics

Astrophysics

24 pages, 17 figures. Accepted for publication in ApJ. Minor corrections to match published version

Scientific paper

10.1086/510305

We present the rest-frame optical (B, V, and R band) luminosity functions (LFs) of galaxies at 22 are consistent with those at z~0. The characteristic magnitudes are significantly brighter than the local values (e.g., ~1.2 mag in the R band), while the measured values for Phi_star are typically ~5 times smaller. The B-band luminosity density at z~2.3 is similar to the local value, and in the R band it is ~2 times smaller than the local value. We present the LF of Distant Red Galaxies (DRGs), which we compare to that of non-DRGs. While DRGs and non-DRGs are characterized by similar LFs at the bright end, the faint-end slope of the non-DRG LF is much steeper than that of DRGs. The contribution of DRGs to the global densities down to the faintest probed luminosities is 14%-25% in number and 22%-33% in luminosity. From the derived rest-frame U-V colors and stellar population synthesis models, we estimate the mass-to-light ratios (M/L) of the different subsamples. The M/L ratios of DRGs are ~5 times higher (in the R and V bands) than those of non-DRGs. The global stellar mass density at 2

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