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Galaxy and Mass Assembly (GAMA): Demonstrating the Power of WISE in the Study of Galaxy Groups to z < 0.1

Cluver, M. E.; Jarrett, T. H.; Taylor, E. N.; Hopkins, A. M.; Brough, S.; Casura, S.; Holwerda, B. W.; Liske, J.; Pimbblet, K. A.; Wright, A. H.

Authors

M. E. Cluver

T. H. Jarrett

E. N. Taylor

A. M. Hopkins

S. Brough

S. Casura

B. W. Holwerda

J. Liske

A. H. Wright



Abstract

© 2020. The American Astronomical Society. All rights reserved. Combining high-fidelity group characterization from the Galaxy and Mass Assembly survey and source-tailored z < 0.1 photometry from the Wide-Field Infrared Survey Explorer (WISE) survey, we present a comprehensive study of the properties of ungrouped galaxies, compared to 497 galaxy groups (4 ≤ N FoF ≤ 20) as a function of stellar and halo mass. Ungrouped galaxies are largely unimodal in WISE color, the result of being dominated by star-forming, late-type galaxies. Grouped galaxies, however, show a clear bimodality in WISE color, which correlates strongly with stellar mass and morphology. We find evidence for an increasing early-type fraction, in stellar mass bins between 1010 M o˙ ≲ M stellar ≲ 1011 M o˙, with increasing halo mass. Using ungrouped, late-type galaxies with star-forming colors (W2-W3 > 3), we define a star-forming main sequence (SFMS), which we use to delineate systems that have moved below the sequence ("quenched"for the purposes of this work). We find that with increasing halo mass, the relative number of late-type systems on the SFMS decreases, with a corresponding increase in early-type, quenched systems at high stellar mass (M stellar > 1010.5 M o˙), consistent with mass quenching. Group galaxies with masses M stellar < 1010.5 M o˙ show evidence of quenching consistent with environmentally driven processes. The stellar mass distribution of late-type, quenched galaxies suggests that it may be an intermediate population as systems transition from being star-forming and late-type to the "red sequence."Finally, we use the projected area of groups on the sky to extract groups that are (relatively) compact for their halo mass. Although these show a marginal increase in their proportion of high-mass and early-type galaxies compared to nominal groups, a clear increase in quenched fraction is not evident.

Citation

Cluver, M. E., Jarrett, T. H., Taylor, E. N., Hopkins, A. M., Brough, S., Casura, S., …Wright, A. H. (2020). Galaxy and Mass Assembly (GAMA): Demonstrating the Power of WISE in the Study of Galaxy Groups to z < 0.1. The Astrophysical journal, 898(1), Article 20. https://doi.org/10.3847/1538-4357/ab9cb8

Journal Article Type Article
Acceptance Date Jun 12, 2020
Online Publication Date Jul 20, 2020
Publication Date Jul 20, 2020
Deposit Date Dec 17, 2020
Publicly Available Date Mar 28, 2024
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 898
Issue 1
Article Number 20
DOI https://doi.org/10.3847/1538-4357/ab9cb8
Keywords Galaxy evolution; Galaxy quenching; Infrared galaxies; Late-type galaxies; Galaxy groups; Star formation
Public URL https://hull-repository.worktribe.com/output/3547459
Publisher URL https://iopscience.iop.org/article/10.3847/1538-4357/ab9cb8
Additional Information Journal title: The Astrophysical Journal; Article type: paper; Article title: Galaxy and Mass Assembly (GAMA): Demonstrating the Power of WISE in the Study of Galaxy Groups to z < 0.1; Copyright information: © 2020. The American Astronomical Society. All rights reserved.; Date received: 2020-03-29; Date accepted: 2020-06-12; Online publication date: 2020-07-20

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©2020 The authors. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder






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