{
  "id": "2212.08083",
  "version": "v1",
  "published": "2022-12-15T19:00:02.000Z",
  "updated": "2022-12-15T19:00:02.000Z",
  "title": "[CII] halos in ALPINE galaxies: smoking-gun of galactic outflows?",
  "authors": [
    "E. Pizzati",
    "A. Ferrara",
    "A. Pallottini",
    "L. Sommovigo",
    "M. Kohandel",
    "S. Carniani"
  ],
  "comment": "Accepted for publication in MNRAS. 11 pages, 6 figures",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "ALMA observations have revealed that many high redshift galaxies are surrounded by extended (10-15 kpc) [CII]-emitting halos which are not predicted by even the most advanced zoom-in simulations. Using a semi-analytical model, in a previous work we suggested that such halos are produced by starburst-driven, catastrophically cooling outflows. Here, we further improve the model and compare its predictions with data from 7 star-forming ($10\\lesssim \\rm SFR/ M_\\odot \\rm yr^{-1}<100$) galaxies at z=4-6, observed in the ALPINE survey. We find that (a) detected [CII] halos are a natural by-product of starburst-driven outflows; (b) the outflow mass loading factors are in the range $4\\lesssim\\eta\\lesssim 7$, with higher $\\eta$ values for lower-mass, lower-SFR systems, and scale with stellar mass as $\\eta \\propto M_*^{-0.43}$, consistently with the momentum-driven hypothesis. Our model suggests that outflows are widespread phenomena in high-z galaxies. However, in low-mass systems the halo extended [CII] emission is likely too faint to be detected with the current levels of sensitivity.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-12-15T19:00:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "alpine galaxies",
      "galactic outflows",
      "smoking-gun",
      "outflow mass loading factors",
      "high redshift galaxies"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}