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The redshift evolution of early-type galaxies in COSMOS: Do massive early-type galaxies form by dry mergers? | | C. Scarlata
; C. M. Carollo
; S.J. Lilly
; R. Feldmann
; P. Kampczyk
; A. Renzini
; A. Cimatti
; C. Halliday
; E. Daddi
; M. T. Sargent
; A. Koekemoer
; N. Scoville
; J-P. Kneib
; A. Leauthaud
; R. Massey
; J. Rhodes
; L. Tasca
; Capak
; H. J. McCracken
; B. Mobasher
; Y. Taniguchi
; D. Thompson
; M. Ajiki
; H. Aussel
; T. Murayama
; D. B. Sanders
; S. Sasaki
; Y. Shioya
; M. Takahashi
; | | Date: |
25 Jan 2007 | | Abstract: | ABRIDGED: We study the evolution since z~1 of the rest-frame B luminosity function of the early-type galaxies (ETGs) in ~0.7 deg^2 in the COSMOS field. In order to identify ALL progenitors of local ETGs we construct the sample of high-z galaxies using two complementary criteria: (i) A morphological selection based on the Zurich Estimator of Structural Types, and (ii) A photometric selection based on the galaxy properties in the (U-V)-M_V color-magnitude diagram. We furthermore constrain both samples so as to ensure that the selected progenitors of ETGs are compatible with evolving into systems which obey the mu_B-r_{hl} Kormendy relation. Assuming the luminosity evolution derived from studies of the fundamental plane for high-z ETGs, our analysis shows no evidence for a decrease in the number density of the most massive ETGs out to z~ 0.7: Both the morphologically- and the photometrically-selected sub-samples show no evolution in the number density of bright (~L>2.5L*) ETGs. Allowing for different star formation histories, and cosmic variance, we estimate a maximum decrease in the number density of massive galaxies at that redshift of ~30%. We observe, however, in both the photometrical and morphological samples, a deficit of up to ~2-3 of fainter ETGs over the same cosmic period. Our results argue against a significant contribution of recent dissipationless ``dry’’ mergers to the formation of the most massive ETGs. We suggest that the mass growth in low luminosity ETGs can be explained with a conversion from z~0.7 to z=0 of blue, irregular and disk galaxies into low- and intermediate-mass ``red’’ ETGs, possibly also through gas rich mergers. | | Source: | arXiv, astro-ph/0701746 | | Services: | Forum | Review | PDF | Favorites | |
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