The HST/ACS Coma Cluster Survey. II. Data Description and Source Catalogs
Abstract
The Coma cluster was the target of a HST-ACS Treasury program designed for deep imaging in the F475W and F814W passbands. Although our survey was interrupted by the ACS instrument failure in 2007, the partially completed survey still covers ~50% of the core high-density region in Coma. Observations were performed for 25 fields that extend over a wide range of cluster-centric radii (~1.75 Mpc) with a total coverage area of 274 arcmin^2. The majority of the fields are located near the core region of Coma (19/25 pointings) with six additional fields in the south-west region of the cluster. In this paper we present reprocessed images and SExtractor source catalogs for our survey fields, including a detailed description of the methodology used for object detection and photometry, the subtraction of bright galaxies to measure faint underlying objects, and the use of simulations to assess the photometric accuracy and completeness of our catalogs. We also use simulations to perform aperture corrections for the SExtractor Kron magnitudes based only on the measured source flux and half-light radius. We have performed photometry for ~73,000 unique objects; one-half of our detections are brighter than the 10-sigma point-source detection limit at F814W=25.8 mag (AB). The slight majority of objects (60%) are unresolved or only marginally resolved by ACS. We estimate that Coma members are 5-10% of all source detections, which consist of a large population of unresolved objects (primarily GCs but also UCDs) and a wide variety of extended galaxies from a cD galaxy to dwarf LSB galaxies. The red sequence of Coma member galaxies has a constant slope and dispersion across 9 magnitudes (-21<M_F814W<-13). The initial data release for the HST-ACS Coma Treasury program was made available to the public in 2008 August. The images and catalogs described in this study relate to our second data release.
Cite
@article{arxiv.1005.3300,
title = {The HST/ACS Coma Cluster Survey. II. Data Description and Source Catalogs},
author = {Derek Hammer and Gijs Verdoes Kleijn and Carlos Hoyos and Mark den Brok and Marc Balcells and Henry C. Ferguson and Paul Goudfrooij and David Carter and Rafael Guzman and Reynier F. Peletier and Russell J. Smith and Alister W. Graham and Neil Trentham and Eric Peng and Thomas H. Puzia and John R. Lucey and Shardha Jogee and Alfonso L. Aguerri and Dan Batcheldor and Terry J. Bridges and Jonathan I. Davies and Carlos del Burgo and Peter Erwin and Ann Hornschemeier and Michael J. Hudson and Avon Huxor and Leigh Jenkins and Arna Karick and Habib Khosroshahi and Ehsan Kourkchi and Yutaka Komiyama and Jennifer Lotz and Ronald O. Marzke and Irina Marinova and Ana Matkovic and David Merritt and Bryan W. Miller and Neal A. Miller and Bahram Mobasher and Mustapha Mouhcine and Sadanori Okamura and Sue Percival and Steven Phillipps and Bianca M. Poggianti and James Price and Ray M. Sharples and R. Brent Tully and Edwin Valentijn},
journal= {arXiv preprint arXiv:1005.3300},
year = {2015}
}
Comments
Accepted for publication in ApJS. A high-resolution version is available at http://archdev.stsci.edu/pub/hlsp/coma/release2/PaperII.pdf