Merger Signatures are Common, but not Universal, in Massive, Recently Quenched Galaxies at z ∼ 0.7

Author:

Verrico Margaret E.ORCID,Setton David J.ORCID,Bezanson RachelORCID,Greene Jenny E.ORCID,Suess Katherine A.ORCID,Goulding Andy D.ORCID,Spilker Justin S.ORCID,Kriek MariskaORCID,Feldmann RobertORCID,Narayanan DesikaORCID,Donofrio VincenzoORCID,Khullar GouravORCID

Abstract

Abstract We present visual classifications of merger-induced tidal disturbances in 143 M * ∼ 1011 M post-starburst galaxies at z ∼ 0.7 identified in the SQuIGG L E Sample. This sample spectroscopically selects galaxies from the Sloan Digital Sky Survey that have stopped their primary epoch of star formation within the past ∼500 Myr. Visual classifications are performed on Hyper Suprime-Cam imaging. We compare to a control sample of mass- and redshift-matched star-forming and quiescent galaxies from the Large Early Galaxy Census and find that post-starburst galaxies are more likely to be classified as disturbed than either category. This corresponds to a factor of 3.6 1.3 + 2.9 times the disturbance rate of older quiescent galaxies and 2.1 .73 + 1.9 times the disturbance rate of star-forming galaxies. Assuming tidal features persist for ≲500 Myr, this suggests merging is coincident with quenching in a significant fraction of these post-starbursts. Galaxies with tidal disturbances are younger on average than undisturbed post-starburst galaxies in our sample, suggesting tidal features from a major merger may have faded over time. This may be exacerbated by the fact that, on average, the undisturbed subset is fainter, rendering low-surface-brightness tidal features harder to identify. However, the presence of 10 young (≲150 Myr since quenching) undisturbed galaxies suggests that major mergers are not the only fast physical mechanism that shut down the primary epoch of star formation in massive galaxies at intermediate redshift.

Funder

National Science Foundation

Research Corporation for Science Advancement

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Post-starburst Galaxies in SDSS-IV MaNGA: Two Broad Categories of Evolutionary Pathways;The Astrophysical Journal;2024-01-29

2. The limitations (and potential) of non-parametric morphology statistics for post-merger identification;Monthly Notices of the Royal Astronomical Society;2024-01-29

3. Stars, Gas, and Star Formation of Distant Post-starburst Galaxies;The Astrophysical Journal;2023-09-01

4. The origin of massive compact galaxies: lessons from IllustrisTNG;Monthly Notices of the Royal Astronomical Society;2023-07-20

5. The large molecular gas fraction of post-starburst galaxies at z > 1;Monthly Notices of the Royal Astronomical Society;2023-06-16

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