THE NEXT GENERATION VIRGO CLUSTER SURVEY. XV. THE PHOTOMETRIC REDSHIFT ESTIMATION FOR BACKGROUND SOURCES - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2014

THE NEXT GENERATION VIRGO CLUSTER SURVEY. XV. THE PHOTOMETRIC REDSHIFT ESTIMATION FOR BACKGROUND SOURCES

T. Erben
  • Fonction : Auteur
H. Hildebrandt
  • Fonction : Auteur
M. Huertas-Company
R. Licitra
  • Fonction : Auteur
N. M. Ball
  • Fonction : Auteur
A. Boselli
Y. -T. Chen
  • Fonction : Auteur
J. -C. Cuillandre
  • Fonction : Auteur
P.A. Duc
P. R. Durrell
  • Fonction : Auteur
P. Guhathakurta
  • Fonction : Auteur
S. D. J. Gwyn
  • Fonction : Auteur
J. J. Kavelaars
A. Lancon
C. Liu
L. A. Macarthur
  • Fonction : Auteur
E. W. Peng
  • Fonction : Auteur
T. H. Puzia
  • Fonction : Auteur
D. Woods
  • Fonction : Auteur

Résumé

The Next Generation Virgo Cluster Survey ( NGVS) is an optical imaging survey covering 104 deg(2) centered on the Virgo cluster. Currently, the complete survey area has been observed in the u* giz bands and one third in the r band. We present the photometric redshift estimation for the NGVS background sources. After a dedicated data reduction, we perform accurate photometry, with special attention to precise color measurements through point-spread function homogenization. We then estimate the photometric redshifts with the Le Phare and BPZ codes. We add a new prior that extends to i(AB) = 12.5 mag. When using the u* griz bands, our photometric redshifts for 15.5mag \textless= i less than or similar to 23 mag or z(phot) less than or similar to 1 galaxies have a bias \textbarDelta(z)\textbar \textless 0.02, less than 5% outliers, a scatter sigma(outl.rej .), and an individual error on zphot that increases with magnitude ( from 0.02 to 0.05 and from 0.03 to 0.10, respectively). When using the u* giz bands over the same magnitude and redshift range, the lack of the r band increases the uncertainties in the 0.3 less than or similar to z(phot) less than or similar to 0.8 range (- 0.05 \textless.Delta(z)\textless - 0.02, sigma(outl. rej) similar to 0.06, 10%-15% outliers, and z(phot. err.) similar to 0.15). We also present a joint analysis of the photometric redshift accuracy as a function of redshift and magnitude. We assess the quality of our photometric redshifts by comparison to spectroscopic samples and by verifying that the angular auto-and cross-correlation function omega(theta) of the entire NGVS photometric redshift sample across redshift bins is in agreement with the expectations.

Dates et versions

hal-01441980 , version 1 (20-01-2017)

Identifiants

Citer

A. Raichoor, S. Mei, T. Erben, H. Hildebrandt, M. Huertas-Company, et al.. THE NEXT GENERATION VIRGO CLUSTER SURVEY. XV. THE PHOTOMETRIC REDSHIFT ESTIMATION FOR BACKGROUND SOURCES. The Astrophysical Journal, 2014, 797 (2), ⟨10.1088/0004-637X/797/2/102⟩. ⟨hal-01441980⟩
351 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More