Bibcode
Hammer, Derek; Verdoes Kleijn, Gijs; Hoyos, Carlos; den Brok, Mark; Balcells, M.; Ferguson, Henry C.; Goudfrooij, Paul; Carter, David; Guzmán, Rafael; Peletier, Reynier F.; Smith, Russell J.; Graham, Alister W.; Trentham, Neil; Peng, Eric; Puzia, Thomas H.; Lucey, John R.; Jogee, Shardha; Aguerri, J. A. L.; Batcheldor, Dan; Bridges, Terry J.; Chiboucas, Kristin; Davies, Jonathan I.; del Burgo, Carlos; Erwin, Peter; Hornschemeier, Ann; Hudson, Michael J.; Huxor, Avon; Jenkins, Leigh; Karick, Arna; Khosroshahi, Habib; Kourkchi, Ehsan; Komiyama, Yutaka; Lotz, Jennifer; Marzke, Ronald O.; Marinova, Irina; Matkovic, Ana; Merritt, David; Miller, Bryan W.; Miller, Neal A.; Mobasher, Bahram; Mouhcine, Mustapha; Okamura, Sadanori; Percival, Sue; Phillipps, Steven; Poggianti, Bianca M.; Price, James; Sharples, Ray M.; Tully, R. Brent; Valentijn, Edwin
Referencia bibliográfica
The Astrophysical Journal Supplement, Volume 191, Issue 1, pp. 143-159 (2010).
Fecha de publicación:
11
2010
Número de citas
47
Número de citas referidas
46
Descripción
The Coma cluster, Abell 1656, was the target of an 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
early 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 or
1°) with a total coverage area of 274 arcmin2. The
majority of the fields are located near the core region of Coma (19/25
pointings) with six additional fields in the southwest 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 its half-light radius. We have performed
photometry for ~73,000 unique objects; approximately one-half of our
detections are brighter than the 10σ 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 compact sources (primarily globular clusters
but also ultra-compact dwarf galaxies) and a wide variety of extended
galaxies from a cD galaxy to dwarf low surface brightness galaxies. The
red sequence of Coma member galaxies has a color-magnitude relation with
a constant slope and dispersion over 9 mag (-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.
Based on observations with the NASA/ESA Hubble Space Telescope obtained
at the Space Telescope Science Institute, which is operated by the
association of Universities for Research in Astronomy, Inc., under NASA
contract NAS 5-26555. These observations are associated with program
GO10861.
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