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Date and Time of the Query: 2019-08-26 T00:33:17 PDT
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For refcode 2014ApJ...797..102R:
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2014ApJ...797..102R The Next Generation Virgo Cluster Survey. XV. The Photometric Redshift Estimation for Background Sources Raichoor, A.; Mei, S.; Erben, T.; Hildebrandt, H.; Huertas-Company, M.; Ilbert, O.; Licitra, R.; Ball, N. M.; Boissier, S.; Boselli, A.; Chen, Y.-T.; Cote, P.; Cuillandre, J.-C.; Duc, P. A.; Durrell, P. R.; Ferrarese, L.; Guhathakurta, P.; Gwyn, S. D. J.; Kavelaars, J. J.; Lancon, A.; Liu, C.; MacArthur, L. A.; Muller, M.; Munoz, R. P.; Peng, E. W.; Puzia, T. H.; Sawicki, M.; Toloba, E.; Van Waerbeke, L.; Woods, D.; Zhang, H. Abstract. 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 15.5 mag <= i <~ 23 mag or z_phot_ <~ 1 galaxies have a bias |Deltaz| < 0.02, less than 5% outliers, a scatter sigma_outl.rej._, and an individual error on z_phot_ 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 <~ z_phot_ <~ 0.8 range (--0.05 < Deltaz < --0.02, sigma_outl.rej_ ~ 0.06, 10%-15% outliers, and z_phot.err._ ~ 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 w(theta) of the entire NGVS photometric redshift sample across redshift bins is in agreement with the expectations. Key words: galaxies: distances and redshifts, galaxies: high-redshift, galaxies: photometry, techniques: photometric
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