{
  "id": "1812.08479",
  "version": "v1",
  "published": "2018-12-20T10:58:56.000Z",
  "updated": "2018-12-20T10:58:56.000Z",
  "title": "The angular momentum of disc galaxies at z=1",
  "authors": [
    "A. Marasco",
    "F. Fraternali",
    "L. Posti",
    "M. Ijtsma",
    "E. M. Di Teodoro",
    "T. Oosterloo"
  ],
  "comment": "11 pages, 4 figures, 1 table. Accepted by A&A",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We investigate the relation between stellar mass and specific stellar angular momentum, or `Fall relation', for a sample of 17 isolated, regularly rotating disc galaxies at z=1. All galaxies have a) rotation curves determined from Halpha emission-line data; b) HST imaging in optical and infrared filters; c) robust determinations of their stellar masses. We use HST images in f814w and f160w filters, roughly corresponding to rest-frames B and I bands, to extract surface brightness profiles for our systems. We robustly bracket the specific angular momentum by assuming that rotation curves beyond the outermost Halpha rotation point stay either flat or follow a Keplerian fall-off. By comparing our measurements with those determined for disc galaxies in the local Universe, we find no evolution in the Fall relation in the redshift range 0<z<1, regardless of the band used and despite the uncertainties in the stellar rotation curves at large radii. This result holds unless stellar masses at z=1 are systematically underestimated by more than 50%. Our findings are compatible with expectations based on a LCDM cosmological framework and support a scenario where both the stellar Tully-Fisher and mass-size relations for spirals do not evolve significantly in this redshift range.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-12-20T10:58:56.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "disc galaxies",
      "holds unless stellar masses",
      "rotation curves",
      "outermost halpha rotation point stay",
      "specific stellar angular momentum"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}