2011MNRAS.417..900D

Query : 2011MNRAS.417..900D

2011MNRAS.417..900D - Mon. Not. R. Astron. Soc., 417, 900-915 (2011/October-3)

The evolution of quiescent galaxies at high redshifts (z ≥ 1.4).

DOMINGUEZ SANCHEZ H., POZZI F., GRUPPIONI C., CIMATTI A., ILBERT O., POZZETTI L., McCRACKEN H., CAPAK P., LE FLOCH E., SALVATO M., ZAMORANI G., CAROLLO C.M., CONTINI T., KNEIB J.-P., LE FEVRE O., LILLY S.J., MAINIERI V., RENZINI A., SCODEGGIO M., BARDELLI S., BOLZONELLA M., BONGIORNO A., CAPUTI K., COPPA G., CUCCIATI O., DE LA TORRE S., DE RAVEL L., FRANZETTI P., GARILLI B., IOVINO A., KAMPCZYK P., KNOBEL C., KOVAC K., LAMAREILLE F., LE BORGNE J.-F., LE BRUN V., MAIER C., MIGNOLI M., PELLO R., PENG Y., PEREZ-MONTERO E., RICCIARDELLI E., SILVERMAN J.D., TANAKA M., TASCA L.A.M., TRESSE L., VERGANI D. and ZUCCA E.

Abstract (from CDS):

The goal of this work is to study the evolution of high-redshift (z ≥ 1.4) quiescent galaxies over an effective area of ∼ 1.7 deg2 in the COSMOS field. Galaxies have been divided according to their star formation activity and the evolution of the different populations, in particular of the quiescent galaxies, has been investigated in detail. We have studied an IRAC (mag_3.6 µm_< 22.0) selected sample of ∼ 18 000 galaxies at z ≥ 1.4 in the COSMOS field with multiwavelength coverage extending from the U band to the Spitzer 24 µm one. We have derived accurate photometric redshifts (σδz/(1+zs) = 0.06 ) through a SED-fitting procedure. Other important physical parameters [masses, ages and star formation rates (SFR)] of the galaxies have been obtained using Maraston models. We have divided our sample into actively star-forming, intermediate and quiescent galaxies depending on their specific star formation rate (SSFR = SFR/M). We have computed the galaxy stellar mass function (GSMF) of the total sample and the different populations at z= 1.4–3.0. We have studied the properties of high-redshift quiescent galaxies finding that they are old (1–4 Gyr), massive (<M>∼ 1010.65 M☉), weakly star-forming stellar populations with low dust extinction [E(B-V) ≤ 0.15] and small e-folding time-scales (τ∼ 0.1–0.3 Gyr). We observe a significant evolution of the quiescent stellar mass function from 2.5 < z < 3.0 to 1.4 < z < 1.6, increasing by ∼ 1 dex in this redshift interval. We find that z∼ 1.5 is an epoch of transition of the GSMF: while the GSMF at z ≳ 1.5 is dominated by the star-forming galaxies at all stellar masses, at z ≲ 1.5 the contribution to the total GSMF of the quiescent galaxies is significant and becomes higher than that of the star-forming population for M ≥ 1010.75 M☉. The fraction of star-forming galaxies decreases from 60–20 per cent from z∼ 2.5–3.0 to 1.4–1.6 for M∼ 1011.0 M☉, while the quiescent population increases from 10–50 per cent at the same redshift and mass intervals. We compare the fraction of quiescent galaxies derived with that predicted by theoretical models and find that the Kitzbichler & White model, implemented on the Millennium Simulation, is the one that better reproduces the shape of the data. Finally, we calculate the stellar mass density of the star-forming and quiescent populations as a function of redshift and find that there is already a significant number of quiescent galaxies at z > 2.5 (logρ[M☉/Mpc3]∼ 6), meaning that efficient star formation had to take place before that time.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): galaxies: evolution - galaxies: high-redshift - galaxies: star formation

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2975 0

Query : 2011MNRAS.417..900D

Basic data :
NAME COSMOS Field -- Region defined in the Sky
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		10 00 28.60 +02 12 21.0 [ ] D 2007ApJS..172..523M
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		09 57 53.49 +02 26 47.1 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		236.82224 +42.12163 [ ]
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', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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NAME COSMOS Field

References (2975 between 1850 and 2024) (Total 2975)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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