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Spot the difference. Impact of different selection criteria on early-type galaxies observed properties in zCOSMOS 20-k sample | | M. Moresco
; L. Pozzetti
; A. Cimatti
; G. Zamorani
; M. Bolzonella
; F. Lamareille
; M. Mignoli
; E. Zucca
; S.J. Lilly
; C.M. Carollo
; T. Contini
; J.-P. Kneib
; O. Le Fevre
; V. Mainieri
; A. Renzini
; M. Scodeggio
; S. Bardelli
; A. Bongiorno
; K. Caputi
; O. Cucciati
; S. de la Torre
; L. de Ravel
; P. Franzetti
; B. Garilli
; A. Iovino
; P. Kampczyk
; C. Knobel
; K. Kovac
; J.-F. Le Borgne
; V. Le Brun
; C. Maier
; R. Pello'
; Y. Peng
; E. Perez-Montero
; V. Presotto
; J.D. Silverman
; M. Tanaka
; L. Tasca
; L. Tresse
; D. Vergani
; L. Barnes
; R. Bordoloi
; A. Cappi
; C. Diener
; A.M. Koekemoer
; E. Le Floch
; C. Lopez-Sanjuan
; H.J. McCracken
; P. Nair
; P. Oesch
; C. Scarlata
; N. Scoville
; N. Welikala
; | | Date: |
6 May 2013 | | Abstract: | We present the analysis of photometric, spectroscopic and morphological
properties for differently selected samples of early-type galaxies up to z=1
extracted from the zCOSMOS-20k spectroscopic survey. This analysis intends to
explore the dependence of galaxy properties on the selection criterion adopted,
to study the degree of contamination due to blue/star-forming/non-passive
outliers, and to provide a comparison between different commonly used selection
criteria. We extracted from the zCOSMOS-20k catalog 6 different samples of
early-type galaxies based on morphology, optical colors, specific star
formation rate, a best-fit to the observed spectral energy distribution, and a
criterion combining morphological, spectroscopic and photometric informations.
The "morphological" sample has the higher percentage of contamination in
colors, specific star formation rate and presence of emission lines, while the
"pure passive" sample is the purest, with properties mostly compatible with no
star formation activity; however, it is also the less economic criterion in
terms of information used. The best performing among the other criteria are the
"photometric type" and the "sSFR", providing a percentage of contamination only
slightly higher than the "pure passive" criterion (on average of a factor of
~2) but with absolute values of the properties of contaminants still compatible
with a red, passively evolving population. We also provided two revised
definitions of early type galaxies based on restframe color-color and
color-mass criteria, that better reproduce the observed bimodalities. The
analysis of the number densities shows evidences of mass-assembly downsizing,
with galaxies at 10.25<log(M/Msun)<10.75 increasing their number by a factor
~2-4 from z=0.6 to z=0.2, by a factor ~2-3 from z=1 to z=0.2 at
10.75<log(M/Msun)<11, and by only ~10-50% from z=1 to z=0.2 at
11<log(M/Msun)<11.5. | | Source: | arXiv, 1305.1308 | | Services: | Forum | Review | PDF | Favorites | |
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