The COSMOS-WIRCam Near-Infrared Imaging Survey. I. BzK-Selected Passive and Star-Forming Galaxy Candidates at z gsim 1.4 - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2010

The COSMOS-WIRCam Near-Infrared Imaging Survey. I. BzK-Selected Passive and Star-Forming Galaxy Candidates at z gsim 1.4

P. Capak
M. Salvato
  • Fonction : Auteur
H. Aussel
D. Thompson
  • Fonction : Auteur
E. Daddi
D. B. Sanders
  • Fonction : Auteur
C. J. Willott
  • Fonction : Auteur
C. Mancini
  • Fonction : Auteur
A. Renzini
  • Fonction : Auteur
R. Cook
  • Fonction : Auteur
J. Kartaltepe
A. M. Koekemoer
  • Fonction : Auteur
T. Murayama
  • Fonction : Auteur
N. Z. Scoville
  • Fonction : Auteur
Y. Shioya
  • Fonction : Auteur
Y. Tanaguchi
  • Fonction : Auteur

Résumé

We present a new near-infrared survey covering the 2 deg2 COSMOS field conducted using WIRCam at the Canada-France-Hawaii Telescope. By combining our near-infrared data with Subaru B and z images, we construct a deep, wide-field optical-infrared catalog. At K s < 23 (AB magnitudes), our survey completeness is greater than 90% and 70% for stars and galaxies, respectively, and contains 143,466 galaxies and 13,254 stars. Using the BzK diagram, we divide our galaxy catalog into quiescent and star-forming galaxy candidates. At z ~ 2, our catalogs contain 3931 quiescent and 25,757 star-forming galaxies representing the largest and most secure sample at these depths and redshifts to date. Our counts of quiescent galaxies turns over at K s ~ 22, an effect that we demonstrate cannot be due to sample incompleteness. Both the number of faint and bright quiescent objects in our catalogs exceed the predictions of a recent semi-analytic model of galaxy formation, indicating potentially the need for further refinements in the amount of merging and active galactic nucleus feedback at z ~ 2 in these models. We measure the angular correlation function for each sample and find that the slope of the field galaxy correlation function flattens to 1.5 by K s ~ 23. At small angular scales, the angular correlation function for passive BzK galaxies is considerably in excess of the clustering of dark matter. We use precise 30-band photometric redshifts to derive the spatial correlation length and the redshift distributions for each object class. At K s < 22, we find r γ/1.8 0 = 7.0 ± 0.5h -1 Mpc for the passive BzK candidates and 4.7 ± 0.8 h -1 Mpc for the star-forming BzK galaxies. Our pBzK galaxies have an average photometric redshift of zp ~ 1.4, in approximate agreement with the limited spectroscopic information currently available. The stacked K s image will be made publicly available from IRSA.

Based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan; the European Southern Observatory under Large Program 175.A-0839, Chile and the Canada-France-Hawaii Telescope with WIRCam and MegaPrime/MegaCam, the latter operated as a joint project by the CFHT Corporation, CEA/DAPNIA, the NRC and CADC of Canada, the CNRS of France, TERAPIX, and the University of Hawaii. This research has made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory (JPL), California Institute of Technology, under contract with the National Aeronautics and Space Administration. Support for this work was provided by the Spitzer Science Center, which is operated by the JPL, California Institute of Technology under NASA contract 1407, NASA through contract 1278386 issued by the JPL.

Dates et versions

hal-03646199 , version 1 (19-04-2022)

Identifiants

Citer

H. J. Mccracken, P. Capak, M. Salvato, H. Aussel, D. Thompson, et al.. The COSMOS-WIRCam Near-Infrared Imaging Survey. I. BzK-Selected Passive and Star-Forming Galaxy Candidates at z gsim 1.4. The Astrophysical Journal, 2010, 708, pp.202-217. ⟨10.1088/0004-637X/708/1/202⟩. ⟨hal-03646199⟩
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