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The K20 survey. V The evolution of the near-IR Luminosity Function | L. Pozzetti
; A. Cimatti
; G. Zamorani
; E. Daddi
; N. Menci
; A. Fontana
; A. Renzini
; M. Mignoli
; F. Poli
; P. Saracco
; T. Broadhurst
; S. Cristiani
; S. D’Odorico
; E. Giallongo
; R. Gilmozzi
; | Date: |
28 Feb 2003 | Journal: | Astron.Astrophys. 402 (2003) 837-848 | Subject: | astro-ph | Affiliation: | Bologna), A. Cimatti (Arcetri), G. Zamorani (Bologna), E. Daddi (ESO), N. Menci (Roma), A. Fontana (Roma), A. Renzini (ESO), M. Mignoli (Bologna), F. Poli (Roma), P. Saracco (Milano), T. Broadhurst (HUJ), S. Cristiani (Trieste), S. D’Odorico (ESO | Abstract: | We present the galaxy rest-frame near-IR Luminosity Function (LF) and its cosmic evolution to z=1.5 based on a spectroscopic survey of a magnitude limited sample of galaxies with Ks<20 (the K20 survey, Cimatti et al. 2002b). The LFs have been derived in the rest-frame J and Ks bands using 3 z bins (z_mean= 0.5, 1, 1.5) and compared to the local near-IR LF. The faint-end of the LFs is consistent with the local estimates, with no evidence for a change either in the slope or normalization up to z<1.3. Viceversa, the density of luminous galaxies (M_Ks-5logh_70<-25.5) is higher than locally at all z and relatively constant or mildly increasing with z within our sample. The data are consistent with a mild luminosity evolution both in the J and Ks-band up to z=1.5 (DeltaM_J=-0.69+-0.12 and DeltaM_K=-0.54+-0.12 at z=1). Moreover, we find that red and early-type galaxies dominate the bright-end of the LF, and that their number density shows at most a small decrease (<30%) up to z=1, thus suggesting that massive elliptical galaxies were already in place at z=1 and they should have formed their stars and assembled their mass at higher z. There appears to be a correlation of the optical/near-IR colors with near-IR luminosities, the most luminous/massive galaxies being red/old. We find a slow evolution with z of the near-IR comoving luminosity density to z=1.5. Finally, we show that hierarchical models overpredict significantly the density of low luminosity galaxies at z<=1 and underpredict the density of luminous galaxies at z>=1, whereas PLE models are more consistent with the data up to z=1.5. The GIF model (Kaufmann et al. 1999) shows a clear deficiency of red luminous galaxies at z=1 compared to our observations and predicts a decrease of luminous galaxies with z not observed in our sample. | Source: | arXiv, astro-ph/0302599 | Services: | Forum | Review | PDF | Favorites |
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