The Local Cluster Survey. I. Evidence of Outside-in Quenching in Dense Environments
AuthorFinn, Rose A.
Haynes, Martha P.
Koopmann, Rebecca A.
Peng, Chien Y.
AffiliationUniv Arizona, Steward Observ
Keywordsgalaxies: clusters: general
galaxies: groups: general
galaxies: star formation
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationRose A. Finn et al 2018 ApJ 862 149
Rights© 2018. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractThe goal of the Local Cluster Survey is to look for evidence of environmentally driven quenching among star-forming galaxies in nearby galaxy groups and clusters. Quenching is linked with environment and stellar mass, and much of the current observational evidence comes from the integrated properties of galaxies. However, the relative size of the stellar and star-forming disk is sensitive to environmental processing and can help identify the mechanisms that lead to a large fraction of quenched galaxies in dense environments. Toward this end, we measure the size of the star-forming disks for 224 galaxies in nine groups and clusters (0.02 < z < 0.04; SFR > 0.1 M-circle dot yr(-1)) using 24 mu m imaging from the Spitzer Space Telescope. We normalize the 24 mu m effective radius (R-24) by the size of the stellar disk (R-d). We find that star-forming galaxies with higher bulge-to-total ratios (BIT) and galaxies in more dense environments have more centrally concentrated star formation. Comparison with H mass fractions and NUV - r colors indicates that a galaxy's transition from gas-rich and blue to depleted and red is accompanied by an increase in the central concentration of star formation. We build a simple model to constrain the timescale over which the star-forming disks shrink in the cluster environment. Our results are consistent with a long-timescale (>2 Gyr) mechanism that produces outside-in quenching, such as the removal of the extended gas halo or weak stripping of the cold disk gas.
VersionFinal published version
SponsorsNSF [AST-0847430, AST-1107390]; NASA [NNX17AF25G]; Brinson Foundation; NASA; Undergraduate ALFALFA Team through NSF [AST-1211005, AST-0724918, AST-0725267, AST-0725380]