{
  "id": "2301.10783",
  "version": "v1",
  "published": "2023-01-25T19:00:01.000Z",
  "updated": "2023-01-25T19:00:01.000Z",
  "title": "The feedback of quasars on their galactic environment",
  "authors": [
    "Andrea Ferrara",
    "Tommaso Zana",
    "Simona Gallerani",
    "Laura Sommovigo"
  ],
  "comment": "accepted for publication in MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Quasar outflows might either quench (negative) or enhance (positive feedback) star formation in galaxies located in the quasar environment. The possible outcome depends on 4 parameters: the quasar ($\\sigma$) and satellite ($\\sigma_*$) halo velocity dispersion, their relative distance, $d$, and satellite disk radius, $r_d$. We find that: (i) small satellites with $\\sigma _* < 164\\ \\sigma_{200}^{2/3}\\, \\rm km\\ s^{-1}$ have their star formation quenched; (ii) in larger satellites, star formation, and hence UV/FIR luminosity, is instead boosted by $>80$\\% in a burst with a typical duration of $5-10$ Myr, if the following positive feedback criterion is met: ${d}/{r_d} < 15 (Q/\\eta)^{1/2} \\sigma_{200}$, where $Q \\approx 1$ is the satellite disk Toomre parameter; the disruption parameter (see eq. 17) must be $\\eta>1$ to prevent complete satellite gas removal. We compare our predictions with ALMA data finding that observed satellites of $z\\simeq 6$ QSOs on average form stars at a $3\\times$ higher rate with respect to field galaxies at the same redshift. Further tests of the model are suggested.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-01-25T19:00:01.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "galactic environment",
      "star formation",
      "prevent complete satellite gas removal",
      "satellite disk toomre parameter",
      "halo velocity dispersion"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}