Barred Galaxies in the Abell 901/2 Supercluster with STAGES
I. Marinova (UT Austin), S. Jogee (UT Austin), A. Heiderman (UT, Austin), F. D. Barazza (EPFL), M. E. Gray (Nottingham), M. Barden, (Innsbruck), C. Wolf (Oxford), C. Y. Peng (NRC HIA, STScI), D. Bacon, (Portsmouth), M. Balogh (Waterloo), E. F. Bell (MPIA), A. Bohm (AIP,

TL;DR
This study investigates the properties and prevalence of galactic bars in a dense cluster environment at z~0.165, revealing how bar fractions vary with galaxy type, luminosity, and environment, and comparing cluster and field galaxies.
Contribution
It provides a comprehensive analysis of bar fractions in cluster galaxies using multiple disk selection methods and explores their dependence on galaxy properties and environment.
Findings
Optical bar fraction is approximately 30-34% across methods.
Bar fraction increases in brighter and bulge-less galaxies.
Bar fraction in cluster galaxies is comparable to field galaxies at similar redshifts.
Abstract
We present a study of bar and host disk evolution in a dense cluster environment, based on a sample of ~800 bright (MV <= -18) galaxies in the Abell 901/2 supercluster at z~0.165. We use HST ACS F606W imaging from the STAGES survey, and data from Spitzer, XMM-Newton, and COMBO-17. We identify and characterize bars through ellipse-fitting, and other morphological features through visual classification. (1) We explore three commonly used methods for selecting disk galaxies. We find 625, 485, and 353 disk galaxies, respectively, via visual classification, a single component S'ersic cut (n <= 2.5), and a blue-cloud cut. In cluster environments, the latter two methods miss 31% and 51%, respectively, of visually-identified disks. (2) For moderately inclined disks, the three methods of disk selection yield a similar global optical bar fraction (f_bar-opt) of 34% +10%/-3%, 31% +10%/-3%, and 30%…
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