Allan Sandage
Allan Rex Sandage ( born June 18, 1926 in Iowa City, Iowa, † November 13, 2010 in San Gabriel, California ) was an American astronomer.
Life and career
Sandage studied at the University of Illinois and at the California Institute of Technology, where he studied from 1949 as a student of Walter Baade with stellar evolution. In 1953 he received his doctorate with a thesis on the globular cluster Messier 3 Since 1952 he worked at the Mount Wilson and Palomar Observatory (now the Observatory of the Carnegie Institution of Washington) in Pasadena.
Sandage placed a large number of observations with a view to determining the value of the Hubble constant. He began by Hubble, whose former assistant Sandage was self-initiated program after his death at the Palomar Observatory on. In the 1970s and 80s he was with Gustav Tammann to supporters relatively low values for the Hubble constant.
In 1960 he discovered the visual equivalent of a radio source that was later identified as a quasar. In addition, he discovered an asteroid and two comets have also been given the name Sandage. He is the author of a photographic atlas of galaxies (Hubble Atlas of Galaxies ) and the revised version of the Shapley - Ames catalog of galaxies.