{
  "id": "2011.04670",
  "version": "v1",
  "published": "2020-11-09T19:00:02.000Z",
  "updated": "2020-11-09T19:00:02.000Z",
  "title": "L-GALAXIES 2020: The evolution of radial metallicity profiles and global metallicities in disc galaxies",
  "authors": [
    "Robert M. Yates",
    "Bruno M. B. Henriques",
    "Jian Fu",
    "Guinevere Kauffmann",
    "Peter A. Thomas",
    "Qi Guo",
    "Simon D. M. White",
    "Patricia Schady"
  ],
  "comment": "21 pages, 19 figures. Submitted to MNRAS. Comments welcome!",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We present a modified version of the L-GALAXIES 2020 semi-analytic model of galaxy evolution, which includes significantly increased direct metal enrichment of the circumgalactic medium (CGM) by supernovae (SNe). These more metal-rich outflows do not require increased mass-loading factors, in contrast to some other galaxy evolution models. This modified L-GALAXIES 2020 model is able to simultaneously reproduce the gas-phase metallicity $(Z_{\\rm g})$ and stellar metallicity $(Z_{*})$ radial profiles observed in nearby disc galaxies by MaNGA and MUSE, as well as the observed mass - metallicity relations for gas and stars at $z=0$ and their evolution back to $z\\sim{}2-3$. A direct CGM enrichment fraction of $\\sim{}90\\%$ for SNe-II is preferred. We find that massive disc galaxies have slightly flatter $Z_{\\rm g}$ profiles than their lower-mass counterparts in L-GALAXIES 2020, due to more efficient enrichment of their outskirts via inside-out growth and metal-rich accretion. Such a weak, positive correlation between stellar mass and $Z_{\\rm g}$ profile slope is also seen in our MaNGA-DR15 sample of 571 star-forming disc galaxies. Although, below ${\\rm log}(M_{*}/{\\rm M}_{\\odot})\\sim{}10.0$ this observational result is strongly dependent on the metallicity diagnostic and morphological selection chosen. In addition, a lowered maximum SN-II progenitor mass of $25{\\rm M}_{\\odot}$, reflecting recent theoretical and observational estimates, can also provide a good match to observed metallicity profiles at $z=0$ in L-GALAXIES 2020. However, this model version fails to reproduce an evolution in $Z_{\\rm g}$ at fixed mass over cosmic time, or the magnesium abundances observed in the intracluster medium (ICM).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-11-09T19:00:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "disc galaxies",
      "radial metallicity profiles",
      "l-galaxies",
      "global metallicities",
      "maximum sn-ii progenitor mass"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 21,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}