Skip to main content

Crowded Field Galaxy Photometry: Precision Colors in the CLASH Clusters

Author(s): Connor, Thomas; Donahue, Megan; Kelson, Daniel D; Moustakas, John; Coe, Dan; et al

To refer to this page use:
Abstract: We present a new method for photometering objects in galaxy clusters. We introduce a mode-filtering technique for removing spatially variable backgrounds, improving both detection and photometric accuracy (roughly halving the scatter in the red sequence compared to previous catalogs of the same clusters). This method is based on robustly determining the distribution of background pixel values and should provide comparable improvement in photometric analysis of any crowded fields. We produce new multiwavelength catalogs for the 25 CLASH cluster fields in all 16 bandpasses from the UV through the near-IR, as well as rest-frame magnitudes. A comparison with spectroscopic values from the literature finds a similar to 30% decrease in the redshift deviation from previously released CLASH photometry. This improvement in redshift precision, in combination with a detection scheme designed to maximize purity, yields a substantial upgrade in cluster member identification over the previous CLASH galaxy catalog. We construct luminosity functions for each cluster, reliably reaching depths of at least 4.5 mag below M* in every case, and deeper still in several clusters. We measure M*, a, and their redshift evolution, assuming the cluster populations are coeval, and find little to no evolution of alpha, -0.9 less than or similar to <alpha > less than or similar to -0.8, and M* values consistent with passive evolution. We present a catalog of galaxy photometry, photometric and spectroscopic redshifts, and rest-frame photometry for the full fields of view of all 25 CLASH clusters. Not only will our new photometric catalogs enable new studies of the properties of CLASH clusters, but mode-filtering techniques, such as those presented here, should greatly enhance the data quality of future photometric surveys of crowded fields.
Publication Date: 10-Oct-2017
Electronic Publication Date: 9-Oct-2017
Citation: Connor, Thomas, Donahue, Megan, Kelson, Daniel D, Moustakas, John, Coe, Dan, Postman, Marc, Bradley, Larry D, Koekemoer, Anton M, Melchior, Peter, Umetsu, Keiichi, Voit, G Mark. (2017). Crowded Field Galaxy Photometry: Precision Colors in the CLASH Clusters. ASTROPHYSICAL JOURNAL, 848 (10.3847/1538-4357/aa8ad5
DOI: doi:10.3847/1538-4357/aa8ad5
ISSN: 0004-637X
EISSN: 1538-4357
Related Item:
Type of Material: Journal Article
Journal/Proceeding Title: ASTROPHYSICAL JOURNAL
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.