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Title: Stellar and Molecular Gas Rotation in a Recently Quenched Massive Galaxy at z ∼ 0.7
Authors: Qiana Hunt
Rachel Bezanson
Jenny E. Greene
Justin S. Spilker
Katherine A. Suess
Mariska Kriek
Desika Narayanan
Robert Feldmann
Arjen Van Der Wel
Petchara Pattarakijwanich
Universiteit Gent
University of California, Berkeley
Niels Bohr Institute
University of Pittsburgh
University of Florida
University of Texas at Austin
Mahidol University
University of Zurich
Max Planck Institut für Astronomie
Princeton University
Keywords: Earth and Planetary Sciences;Physics and Astronomy
Issue Date: 20-Jun-2018
Citation: Astrophysical Journal Letters. Vol.860, No.2 (2018)
Abstract: © 2018. The American Astronomical Society. All rights reserved.. The process by which massive galaxies transition from blue, star-forming disks into red, quiescent galaxies remains one of the most poorly understood aspects of galaxy evolution. In this investigation, we attempt to gain a better understanding of how star formation is quenched by focusing on a massive post-starburst galaxy at z =0.747. The target has a high stellar mass and a molecular gas fraction of 30% - unusually high for its low star formation rate (SFR). We look for indicators of star formation suppression mechanisms in the stellar kinematics and age distribution of the galaxy obtained from spatially resolved Gemini Integral-field spectra and in the gas kinematics obtained from the Atacama Large Millimeter/submillimeter Array (ALMA). We find evidence of significant rotation in the stars, but we do not detect a stellar age gradient within 5 kpc. The molecular gas is aligned with the stellar component, and we see no evidence of strong gas outflows. Our target may represent the product of a merger-induced starburst or of morphological quenching; however, our results are not completely consistent with any of the prominent quenching models.
ISSN: 20418213
Appears in Collections:Scopus 2018

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