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The impact of stellar feedback on the density and velocity structure of the interstellar medium

Grisdale, Kearn, Agertz, Oscar, Romeo, AB, Renaud, Florent and Read, Justin (2016) The impact of stellar feedback on the density and velocity structure of the interstellar medium Monthly Notices of the Royal Astronomical Society, 466 (1). pp. 1093-1110.

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Abstract

We study the impact of stellar feedback in shaping the density and velocity structure of neutral hydrogen (H I) in disc galaxies. For our analysis, we carry out ∼4.6 pc resolution N-body+adaptive mesh refinement hydrodynamic simulations of isolated galaxies, set up to mimic a Milky Way and a Large and Small Magellanic Cloud. We quantify the density and velocity structure of the interstellar medium using power spectra and compare the simulated galaxies to observed H I in local spiral galaxies from THINGS (The H I Nearby Galaxy Survey). Our models with stellar feedback give an excellent match to the observed THINGS H I density power spectra. We find that kinetic energy power spectra in feedback-regulated galaxies, regardless of galaxy mass and size, show scalings in excellent agreement with supersonic turbulence (E(k) ∝ k-2) on scales below the thickness of the H I layer. We show that feedback influences the gas density field, and drives gas turbulence, up to large (kpc) scales. This is in stark contrast to density fields generated by large-scale gravity-only driven turbulence. We conclude that the neutral gas content of galaxies carries signatures of stellar feedback on all scales.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Grisdale, Kearnk.grisdale@surrey.ac.ukUNSPECIFIED
Agertz, Oscaro.agertz@surrey.ac.ukUNSPECIFIED
Romeo, ABUNSPECIFIEDUNSPECIFIED
Renaud, Florentf.renaud@surrey.ac.ukUNSPECIFIED
Read, Justinj.read@surrey.ac.ukUNSPECIFIED
Date : 5 December 2016
Identification Number : 10.1093/mnras/stw3133
Copyright Disclaimer : 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society, following peer review. The version of record Kearn Grisdale, Oscar Agertz, Alessandro B. Romeo, Florent Renaud, Justin I. Read; The impact of stellar feedback on the density and velocity structure of the interstellar medium. Mon Not R Astron Soc 2017; 466 (1): 1093-1110. doi: 10.1093/mnras/stw3133 is available online at: https://doi.org/10.1093/mnras/stw3133. This is an arXiv version of the work.
Uncontrolled Keywords : galaxies: evolution, galaxies: ISM, galaxies: spiral, galaxies: structure
Depositing User : Symplectic Elements
Date Deposited : 16 Mar 2017 08:59
Last Modified : 19 Jul 2017 13:11
URI: http://epubs.surrey.ac.uk/id/eprint/813790

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