{
  "id": "0707.3278",
  "version": "v1",
  "published": "2007-07-22T18:48:20.000Z",
  "updated": "2007-07-22T18:48:20.000Z",
  "title": "ALFALFA: HI Cosmology in the Local Universe",
  "authors": [
    "Riccardo Giovanelli"
  ],
  "comment": "To appear in Proceedings of IAU Symp #244, \"Dark Galaxies and Lost Baryons\", June 2007, 10 pages including 5 figures",
  "categories": [
    "astro-ph"
  ],
  "abstract": "For the last 25 years, the 21 cm line has been used productively to investigate the large-scale structure of the Universe, its peculiar velocity field and the measurement of cosmic parameters. In February 2005 a blind HI survey that will cover 7074 square degrees of the high latitude sky was started at Arecibo, using the 7-beam feed L-band feed array (ALFA). Known as the Arecibo Legacy Fast ALFA (ALFALFA) Survey, the program is producing a census of HI-bearing objects over a cosmologically significant volume of the local Universe. With respect to previous blind HI surveys, ALFALFA offers an improvement of about one order of magnitude in sensitivity, 4 times the angular resolution, 3 times the spectral resolution, and 1.6 times the total bandwidth of HIPASS. ALFALFA can detect 7 X 10**4 D**2 solar masses of HI, where D is the source distance in Mpc. As of mid 2007, 44% of the survey observations and 15% of the source extraction are completed. We discuss the status of the survey and present a few preliminary results, in particular with reference to the proposed \"dark galaxy\" VirgoHI21.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2007-07-22T18:48:20.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "local universe",
      "hi cosmology",
      "blind hi survey",
      "arecibo legacy fast alfa",
      "peculiar velocity field"
    ],
    "publication": {
      "doi": "10.1017/S1743921307013853"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 756442
    }
  }
}