CLASH: Accurate Photometric Redshifts with 14 HST bands in Massive Galaxy Cluster Cores

Abstract

We present accurate photometric redshifts for galaxies observed by the Cluster Lensing and Supernova survey with Hubble (CLASH). CLASH observed 25 massive galaxy cluster cores with the Hubble Space Telescope in 16 filters spanning 0.2 - 1.7 $\mu$m. Photometry in such crowded fields is challenging. Compared to our previously released catalogs, we make several improvements to the photometry, including smaller apertures, ICL subtraction, PSF matching, and empirically measured uncertainties. We further improve the Bayesian Photometric Redshift (BPZ) estimates by adding a redder elliptical template and by inflating the photometric uncertainties of the brightest galaxies. The resulting photometric redshift accuracies are dz/(1+z) $\sim$ 0.8\%, 1.0\%, and 2.0\% for galaxies with I-band F814W AB magnitudes $<$ 18, 20, and 23, respectively. These results are consistent with our expectations. They improve on our previously reported accuracies by a factor of 4 at the bright end and a factor of 2 at the faint end. Our new catalog includes 1257 spectroscopic redshifts, including 382 confirmed cluster members. We also provide stellar mass estimates. Finally, we include lensing magnification estimates of background galaxies based on our public lens models. Our new catalog of all 25 CLASH clusters is available via MAST. The analysis techniques developed here will be useful in other surveys of crowded fields, including the Frontier Fields and surveys carried out with J-PAS and JWST.

21 pages, 21 figures, 5 tables. Photo-z Catalogues Available. Accepted for publication in MNRAS

References in corpus (19)

• The Hubble Ultra Deep Field
• Galaxies in the Hubble Ultra Deep Field: I. Detection, Multiband Photometry, Photometric Redshifts, and Morphology
• Hubble Space Telescope Combined Strong and Weak Lensing Analysis of the CLASH Sample: Mass and Magnification Models and Systematic Uncertainties
• CLASH: Weak-Lensing Shear-and-Magnification Analysis of 20 Galaxy Clusters
• CLASH: The Concentration-Mass Relation of Galaxy Clusters
• CLASH-VLT: Insights on the mass substructures in the Frontier Fields Cluster MACS J0416.1-2403 through accurate strong lens modeling
• The ALHAMBRA Project: A large area multi medium-band optical and NIR photometric survey
• J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical Survey
• The MUSIC of CLASH: predictions on the concentration-mass relation
• The Multiwavelength Survey by Yale-Chile (MUSYC): Deep Near-Infrared Imaging and the Selection of Distant Galaxies
• Optimal filter systems for photometric redshift estimation
• Intra Cluster Light properties in the CLASH-VLT cluster MACS J1206.2-0847
• Ultraviolet Morphologies and Star-Formation Rates of CLASH Brightest Cluster Galaxies
• CLASH-VLT: The stellar mass function and stellar mass density profile of the z=0.44 cluster of galaxies MACS J1206.2-0847
• Evidence for self-interaction of charge distribution in charge-coupled devices
• CLASH: Extending galaxy strong lensing to small physical scales with distant sources highly-magnified by galaxy cluster members
• Photometric Redshifts and Systematic Variations in the SEDs of Luminous Red Galaxies from the SDSS DR7
• Not In Our Backyard: Spectroscopic Support for the CLASH z=11 Candidate MACS0647-JD
• A $K_s$-band selected catalogue of objects in the ALHAMBRA survey

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