Media type: E-Article Title: Quasar ionization of Lyman-alpha clouds - The proximity effect, a probe of the ultraviolet background at high redshift Contributor: Bajtlik, Stanislaw; Duncan, Robert C.; Ostriker, Jeremiah P. imprint: American Astronomical Society, 1988 Published in: The Astrophysical Journal Language: English DOI: 10.1086/166217 ISSN: 0004-637X; 1538-4357 Keywords: Space and Planetary Science ; Astronomy and Astrophysics Origination: Footnote: Access State: Open Access