Deep CFHT Y-band imaging of VVDS-F22 field: I. data products and photometric redshifts

Abstract

We present our deep $Y$-band imaging data of a two square degree field within the F22 region of the VIMOS VLT Deep Survey. The observations were conducted using the WIRCam instrument mounted at the Canada--France--Hawaii Telescope (CFHT). The total on-sky time was 9 hours, distributed uniformly over 18 tiles. The scientific goals of the project are to select faint quasar candidates at redshift $z>2.2$, and constrain the photometric redshifts for quasars and galaxies. In this paper, we present the observation and the image reduction, as well as the photometric redshifts that we derived by combining our $Y$-band data with the CFHTLenS $u^{\ast }{g}^{\prime }{r}^{\prime }{i}^{\prime }{z}^{\prime }$ optical data and UKIDSS DXS $JHK$ near-infrared data. With $J$-band image as reference total $\sim$80,000 galaxies are detected in the final mosaic down to $Y$-band $5\sigma$ point source limiting depth of 22.86 mag. Compared with the $\sim$3500 spectroscopic redshifts, our photometric redshifts for galaxies with $z<1.5$ and $i^{\prime }\lesssim 24.0$ mag have a small systematic offset of $|\Delta z|\lesssim 0.2$, 1$\sigma$ scatter $0.03<{\sigma }_{\Delta z}<0.06$, and less than 4.0% of catastrophic failures. We also compare to the CFHTLenS photometric redshifts, and find that ours are more reliable at $z\gtrsim 0.6$ because of the inclusion of the near-infrared bands. In particular, including the $Y$-band data can improve the accuracy at $z\sim 1.0-2.0$ because the location of the 4000Å-break is better constrained. The $Y$-band images, the multi-band photometry catalog and the photometric redshifts are released at \url{http://astro.pku.edu.cn/astro/data/DYI.html}.

16 pages, 12 figures, 4 tables. AJ accepted. Updated access to the data: https://zenodo.org/record/1400031

References in corpus (21)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• EAZY: A Fast, Public Photometric Redshift Code
• The hierarchical formation of the brightest cluster galaxies
• COSMOS Photometric Redshifts with 30-bands for 2-deg2
• The COSMOS2015 Catalog: Exploring the 1<z<6 Universe with half a million galaxies
• Galaxies in the Hubble Ultra Deep Field: I. Detection, Multiband Photometry, Photometric Redshifts, and Morphology
• Weak Gravitational Lensing with COSMOS: Galaxy Selection and Shape Measurements
• Gravitational Lensing Analysis of the Kilo Degree Survey
• SDSS Standard Star Catalog for Stripe 82: the Dawn of Industrial 1% Optical Photometry
• The Multiwavelength Survey by Yale-Chile (MUSYC): Deep Medium-Band optical imaging and high quality 32-band photometric redshifts in the ECDF-S
• The UKIRT Infrared Deep Sky Survey Early Data Release
• The VISTA Science Archive
• Photometric redshift analysis in the Dark Energy Survey Science Verification data
• The Vimos VLT Deep Survey: Global properties of 20000 galaxies in the I_AB<=22.5 WIDE survey
• Redshift distributions of galaxies in the DES Science Verification shear catalogue and implications for weak lensing
• A Public, K-Selected, Optical-to-Near-Infrared Catalog of the Extended Chandra Deep Field South (ECDFS) from the MUltiwavelength Survey by Yale-Chile (MUSYC)
• The Multiwavelength Survey by Yale-Chile (MUSYC): Deep Near-Infrared Imaging and the Selection of Distant Galaxies
• Luminous K-band Selected Quasars from UKIDSS
• The Next Generation Virgo Cluster Survey. XV. The photometric redshift estimation for background sources
• Sky Variability in the y Band at the LSST Site

Cited by in corpus (2)

• Variability and transient search in the SUDARE-VOICE field: a new method to extract the light curves
• Deep CFHT Y-band Imaging of VVDS-F22 Field: II. Quasar Selection and Quasar Luminosity Function