The HST/ACS Coma Cluster Survey. II. Data Description and Source Catalogs

Дата и время публикации : 2010-05-18T19:54:00Z

Авторы публикации и институты :
Derek Hammer
Gijs Verdoes Kleijn
Carlos Hoyos
Mark den Brok
Marc Balcells
Henry C. Ferguson
Paul Goudfrooij
David Carter
Rafael Guzman
Reynier F. Peletier
Russell J. Smith
Alister W. Graham
Neil Trentham
Eric Peng
Thomas H. Puzia
John R. Lucey
Shardha Jogee
Alfonso L. Aguerri
Dan Batcheldor
Terry J. Bridges
Jonathan I. Davies
Carlos del Burgo
Peter Erwin
Ann Hornschemeier
Michael J. Hudson
Avon Huxor
Leigh Jenkins
Arna Karick
Habib Khosroshahi
Ehsan Kourkchi
Yutaka Komiyama
Jennifer Lotz
Ronald O. Marzke
Irina Marinova
Ana Matkovic
David Merritt
Bryan W. Miller
Neal A. Miller
Bahram Mobasher
Mustapha Mouhcine
Sadanori Okamura
Sue Percival
Steven Phillipps
Bianca M. Poggianti
James Price
Ray M. Sharples
R. Brent Tully
Edwin Valentijn

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: Accepted for publication in ApJS. A high-resolution version is available at
Первичная категория: astro-ph.GA

Все категории : astro-ph.GA

Краткий обзор статьи: 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.

Category: Physics