Header

UZH-Logo

Maintenance Infos

Stellar and Molecular Gas Rotation in a Recently Quenched Massive Galaxy at z ∼ 0.7


Hunt, Qiana; Bezanson, Rachel; Greene, Jenny E; Spilker, Justin S; Suess, Katherine A; Kriek, Mariska; Narayanan, Desika; Feldmann, Robert; van der Wel, Arjen; Pattarakijwanich, Petchara (2018). Stellar and Molecular Gas Rotation in a Recently Quenched Massive Galaxy at z ∼ 0.7. Astrophysical Journal Letters, 860(2):L18.

Abstract

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.

Abstract

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.

Statistics

Citations

Dimensions.ai Metrics
3 citations in Web of Science®
2 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

9 downloads since deposited on 01 Mar 2019
9 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Space and Planetary Science, Astronomy and Astrophysics
Language:English
Date:18 June 2018
Deposited On:01 Mar 2019 15:44
Last Modified:17 Sep 2019 19:39
Publisher:IOP Publishing
ISSN:2041-8205
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.3847/2041-8213/aaca9a

Download

Download PDF  'Stellar and Molecular Gas Rotation in a Recently Quenched Massive Galaxy at z ∼ 0.7'.
Preview
Content: Published Version
Filetype: PDF
Size: 1MB
View at publisher