Evolution of the cold gas properties of simulated post-starburst galaxies

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http://hdl.handle.net/10138/308468

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Davis , T A , van de Voort , F , Rowlands , K , McAlpine , S , Wild , V & Crain , R A 2019 , ' Evolution of the cold gas properties of simulated post-starburst galaxies ' , Monthly Notices of the Royal Astronomical Society , vol. 484 , no. 2 , pp. 2447-2461 . https://doi.org/10.1093/mnras/stz180

Title: Evolution of the cold gas properties of simulated post-starburst galaxies
Author: Davis, Timothy A.; van de Voort, Freeke; Rowlands, Kate; McAlpine, Stuart; Wild, Vivienne; Crain, Robert A.
Other contributor: University of Helsinki, Department of Physics
Date: 2019-04
Language: eng
Number of pages: 15
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stz180
URI: http://hdl.handle.net/10138/308468
Abstract: Post-starburst galaxies arc typically considered to be a transition population, en route to the red sequence after a recent quenching event. Despite this, recent observations have shown that these objects typically have large reservoirs of cold molecular gas. In this paper we study the star-forming gas properties of a large sample of post-starburst galaxies selected from the cosmological, hydrodynamical EAGLE simulations. These objects resemble observed high-mass post-starburst galaxies both spectroscopically and in terms of their space density, stellar mass distribution, and sizes. We find that the vast majority of simulated post-starburst galaxies have significant gas reservoirs, with star-forming gas masses approximate to 10(9) M-circle dot, in good agreement with those seen in observational samples. The simulation reproduces the observed time evolution of the gas fraction of the post-starburst galaxy population, with the average galaxy losing approximate to 90 per cent of its star-forming interstellar medium in only approximate to 600 Myr. A variety of gas consumption/loss processes are responsible for this rapid evolution, including mergers and environmental effects, while active galactic nuclei play only a secondary role. The fast evolution in the gas fraction of post-starburst galaxies is accompanied by a clear decrease in the efficiency of star formation due to a decrease in the dense gas fraction. We predict that forthcoming ALMA observations of the gas reservoirs of low-redshift post-starburst galaxies will show that the molecular gas is typically compact and has disturbed kinematics, reflecting the disruptive nature of many of the evolutionary pathways that build up the post-starburst galaxy population.
Subject: galaxies: evolution
galaxies: interactions
galaxies: ISM
galaxies: kinematics and dynamics
galaxies: starburst
galaxies: star formation
STELLAR POPULATION SYNTHESIS
STAR-FORMATION HISTORIES
MOLECULAR GAS
ATLAS(3D) PROJECT
E PLUS
LUMINOSITY FUNCTIONS
EAGLE SIMULATIONS
ATOMIC-HYDROGEN
REDSHIFT SURVEY
FORMATION LAWS
115 Astronomy, Space science
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