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On the Transition of the Galaxy Quenching Mode at 0.5 z 1 in CANDELS

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posted on 2024-08-06, 11:34 authored by F. S. Liu, Meng Jia, Hassen M. Yesuf, S. M. Faber, David C. Koo, Yicheng Guo, Eric F. Bell, Dongfei Jiang, Weichen Wang, Anton M. Koekemoer, Xianzhong Zheng, Jerome J. Fang, Guillermo Barro, Pablo G. Pérez-González, Avishai Dekel, Dale Kocevski, Nimish P. Hathi, Darren CrotonDarren Croton, M. Huertas-Company, Xianmin Meng, Wei Tong, Lu Liu
We investigate the galaxy quenching process at intermediate redshift using a sample of similar to 4400 galaxies with M-* >10(9) M-circle dot between redshift 0.5 and 1.0 in all five CANDELS fields. We divide this sample, using the integrated specific star formation rate (sSFR), into four subgroups: star-forming galaxies (SFGs) above and below the ridge of the star-forming main sequence (SFMS), transition galaxies and quiescent galaxies. We study their UVI (U -V versus V-I) color gradients to infer their sSFR gradients out to twice effective radii. We show that on average both star-forming and transition galaxies at all masses are not fully quenched at any radii, whereas quiescent galaxies are fully quenched at all radii. We find that at low masses (M-* = 10(9) - 10(10) M-circle dot) SFGs both above and below the SFMS ridge generally have flat sSFR profiles, whereas the transition galaxies at the same masses generally have sSFRs that are more suppressed in their outskirts. In contrast, at high masses (M-* > 10(10.5) M-circle dot), SFGs above and below the SFMS ridge and transition galaxies generally have varying degrees of more centrally suppressed sSFRs relative to their outskirts. These findings indicate that at z similar to 0.5-1.0 the main galaxy quenching mode depends on its already formed stellar mass, exhibiting a transition from "the outside-in" at M*<= 10(10) M-circle dot to "the inside-out" at M-* > 10(10.5) M-circle dot. In other words, our findings support that internal processes dominate the quenching of massive galaxies, whereas external processes dominate the quenching of low-mass galaxies.

Funding

Ministry of Economy, Industry and Competitiveness

European Commission

National Aeronautics and Space Administration

National Science Foundation

Directorate for Mathematical & Physical Sciences

Department of the Treasury

History

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ISSN

1538-4357

Journal title

Astrophysical Journal

Volume

860

Issue

1

Article number

article no. 60

Pagination

1 p

Publisher

American Astronomical Society

Copyright statement

Copyright © 2018 The American Astronomical Society. All rights reserved. The published version is reproduced in accordance with the copyright policy of the publisher.

Language

eng

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