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The effect of galactic feedback on gas accretion and wind recycling

van de Voort, Freeke 2017. The effect of galactic feedback on gas accretion and wind recycling. Gas Accretion onto Galaxies, Vol. 430. Astrophysics and Space Science Library, Kluwer Academic Publishers, pp. 301-321. (10.1007/978-3-319-52512-9_13)

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Abstract

In the absence of galactic winds, the rate at which gas accretes onto galaxies is determined by the gravitational potential and by radiative cooling. However, outflows driven by supernovae and active galactic nuclei not only eject gas from galaxies, but also prevent gas from accreting in the first place. Furthermore, gas previously ejected from a galaxy can re-accrete onto (the same or a different) galaxy. Because this gas has a high metallicity, its cooling rate is relatively high, which will increase its chances to re-accrete. This complex interplay between gas inflows and outflows is discussed in this chapter. Wind recycling is found to be an important process that fuels galaxies at late times and the recycled gas has different properties than gas accreting for the first time. Quantitative conclusions, however, vary between studies, because the amount of wind recycling is dependent on the details of the feedback model. We discuss these differences, known caveats, and ways to make progress in understanding how galaxies are fed at low redshift.

Item Type: Book Section
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: Kluwer Academic Publishers
ISBN: 9783379525112
ISSN: 0067-0057
Last Modified: 10 Mar 2020 11:30
URI: https://orca.cardiff.ac.uk/id/eprint/130248

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