2016/12/02 by Freeke van de Voort
Physics and Astronomy · #Accretion (finance) #Active galactic nucleus #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Gravitation #Gravitational potential #Radiative transfer #Supernova #astro-ph.GA
paper · pdf · doi:10.1007/978-3-319-52512-9_13
published as Gas Accretion onto Galaxies, ASSL, 2017, Volume 430, p. 301. ISBN 978-3-319-52511-2. Springer International Publishing AG · Invited review to appear in Gas Accretion onto Galaxies, Astrophysics and Space Science Library, eds. A. J. Fox & R. Davé, to be published by Springer
arxiv created 2016/12/02 · openalex created_date 2016/12/16 · openalex publication_date 2017/01/01 · arxiv updated 2019/04/12 · openalex updated_date 2026/08/05
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.