2009A&A...493...39M


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET22:47:46

2009A&A...493...39M - Astronomy and Astrophysics, volume 493, 39-49 (2009/1-1)

The zCOSMOS redshift survey: the three-dimensional classification cube and bimodality in galaxy physical properties.

MIGNOLI M., ZAMORANI G., SCODEGGIO M., CIMATTI A., HALLIDAY C., LILLY S.J., POZZETTI L., VERGANI D., CAROLLO C.M., CONTINI T., LE FEVRE O., MAINIERI V., RENZINI A., 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., KNEIB J.-P., KNOBEL C., KOVAC K., LAMAREILLE F., LE BORGNE J.-F., LE BRUN V., MAIER C., PELLO R., PENG Y., PEREZ-MONTERO E., RICCIARDELLI E., SCARLATA C., SILVERMAN J.D., TANAKA M., TASCA L., TRESSE L., ZUCCA E., ABBAS U., BOTTINI D., CAPAK P., CAPPI A., CASSATA P., FUMANA M., GUZZO L., LEAUTHAUD A., MACCAGNI D., MARINONI C., McCRACKEN H.J., MEMEO P., MENEUX B., OESCH P., PORCIANI C., SCARAMELLA R. and SCOVILLE N.

Abstract (from CDS):

We investigate the relationships between three main optical galaxy observables (spectral properties, colors, and morphology), exploiting the data set provided by the COSMOS/zCOSMOS survey. The purpose of this paper is to define a simple galaxy classification cube, with a carefully selected sample of ≃1000 galaxies. Using medium resolution spectra of the first 1k zCOSMOS-bright sample, optical photometry from the Subaru/COSMOS observations, and morphological measurements derived from ACS imaging, we analyze the properties of the galaxy population out to z∼1. Applying three straightforward classification schemes (spectral, photometric, and morphological), we identify two main galaxy types, which appear to be linked to the bimodality of galaxy population. The three parametric classifications constitute the axes of a ``classification cube''. A very good agreement exists between the classification from spectral data (quiescent/star-forming galaxies) and the one based on colors (red/blue galaxies). The third parameter (morphology) is not as well correlated with the first two; in fact, a good correlation between the spectral classification and the classification based on morphological analysis (early-/late-type galaxies) is achieved only after partially complementing the morphological classification with additional color information. Finally, analyzing the 3D-distribution of all galaxies in the sample, we find that about 85% of the galaxies show a fully concordant classification, being either quiescent, red, bulge-dominated galaxies (∼20%) or star-forming, blue, disk-dominated galaxies (∼65%). These results imply that the galaxy bimodality is a consistent behavior both in morphology, color, and dominant stellar population, at least out to z∼1.

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Journal keyword(s): galaxies: general - galaxies: evolution - galaxies: fundamental parameters

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 - 2021
#notes
1 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2197 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET22:47:46

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NAME COSMOS Field -- Region defined in the sky
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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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References (2197 between 1850 and 2021) (Total 2197)
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2021.02.24-22:47:46

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