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The Local Cluster Survey. I. Evidence of Outside-in Quenching in Dense Environments

Finn, Rose A. and Desai, Vandana and Rudnick, Gregory and Balogh, Michael and Haynes, Martha P. and Jablonka, Pascale and Koopmann, Rebecca A. and Moustakas, John and Peng, Chien Y. and Poggianti, Bianca and Rines, Kenneth and Zaritsky, Dennis (2018) The Local Cluster Survey. I. Evidence of Outside-in Quenching in Dense Environments. Astrophysical Journal, 862 (2). Art. No. 149. ISSN 1538-4357. doi:10.3847/1538-4357/aac32a.

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The 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⊙ yr^(−1)) using 24 μm imaging from the Spitzer Space Telescope. We normalize the 24 μm 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 (B/T) and galaxies in more dense environments have more centrally concentrated star formation. Comparison with H I 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Finn, Rose A.0000-0001-8518-4862
Desai, Vandana0000-0002-1340-0543
Rudnick, Gregory0000-0001-5851-1856
Haynes, Martha P.0000-0001-5334-5166
Poggianti, Bianca0000-0001-8751-8360
Zaritsky, Dennis0000-0002-5177-727X
Additional Information:© 2018 The American Astronomical Society. Received 2017 January 11; revised 2018 May 2; accepted 2018 May 6; published 2018 August 1. R.A.F. gratefully acknowledges support from NSF grant AST-0847430. R.A.F., G.R., V.D., P.J., and D.Z. thank the International Space Science Institute for facilitating discussions that directly influenced this work. G.R. recognizes the support of NASA grant NNX17AF25G. Many Siena College undergraduate students have contributed to this work, including Corey Snitchler, Trevor Quirk, Erin O'Malley, Amy McCann, Michael Englert, Debra Johnson, and Alissa Earle. R.A.K., R.A.F., and M.P.H. acknowledge support of the Undergraduate ALFALFA Team through NSF AST-1211005, AST-0724918, AST-0725267, and AST-0725380. The ALFALFA team at Cornell is supported by NSF grant AST-1107390 and by the Brinson Foundation. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration, 2013). We thank the anonymous referee whose suggestions led to significant improvements in this paper. Facilities: Spitzer - Spitzer Space Telescope satellite, IRSA - , NED - , ADS - .
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Brinson FoundationUNSPECIFIED
Subject Keywords:galaxies: clusters: general – galaxies: evolution – galaxies: groups: general – galaxies: star formation
Issue or Number:2
Record Number:CaltechAUTHORS:20180809-145621184
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Official Citation:Rose A. Finn et al 2018 ApJ 862 149
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88716
Deposited By: Tony Diaz
Deposited On:09 Aug 2018 22:20
Last Modified:16 Nov 2021 00:29

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