{
  "id": "1202.2865",
  "version": "v1",
  "published": "2012-02-13T21:02:15.000Z",
  "updated": "2012-02-13T21:02:15.000Z",
  "title": "A Flux-Limited Sample of z~1 Ly-alpha Emitting Galaxies in the CDFS",
  "authors": [
    "A. J. Barger",
    "L. L. Cowie",
    "I. G. B. Wold"
  ],
  "comment": "18 pages, in press at The Astrophysical Journal",
  "journal": "Astrophys.J.749:106,2012",
  "categories": [
    "astro-ph.CO"
  ],
  "abstract": "We describe a method for obtaining a flux-limited sample of Ly-alpha emitters from GALEX grism data. We show that the multiple GALEX grism images can be converted into a three-dimensional (two spatial axes and one wavelength axis) data cube. The wavelength slices may then be treated as narrowband images and searched for emission-line galaxies. For the GALEX NUV grism data, the method provides a Ly-alpha flux-limited sample over the redshift range z=0.67-1.16. We test the method on the Chandra Deep Field South field, where we find 28 Ly-alpha emitters with faint continuum magnitudes (NUV>22) that are not present in the GALEX pipeline sample. We measure the completeness by adding artificial emitters and measuring the fraction recovered. We find that we have an 80% completeness above a Ly-alpha flux of 10^-15 erg/cm^2/s. We use the UV spectra and the available X-ray data and optical spectra to estimate the fraction of active galactic nuclei in the selection. We report the first detection of a giant Ly-alpha blob at z<1, though we find that these objects are much less common at z=1 than at z=3. Finally, we compute limits on the z~1 Ly-alpha luminosity function and confirm that there is a dramatic evolution in the luminosity function over the redshift range z=0-1.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-02-13T21:02:15.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ly-alpha emitting galaxies",
      "flux-limited sample",
      "chandra deep field south field",
      "ly-alpha emitters",
      "grism data"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/749/2/106",
      "journal": "The Astrophysical Journal",
      "year": 2012,
      "month": "Apr",
      "volume": 749,
      "number": 2,
      "pages": 106
    },
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1089037,
      "adsabs": "2012ApJ...749..106B"
    }
  }
}