Sandage , Allan Rex

Sandage , Allan Rex
(1926–) American astronomer
Born in Iowa City, Sandage graduated from the University of Illinois in 1948 and obtained his PhD in 1953 from the California Institute of Technology. He was on the staff of the Hale Observatories at Mount Wilson and Mount Palomar from 1952 when he began as an assistant to Edwin Hubble. He was professor of physics at Johns Hopkins University (1987–88) and is now on the staff of the Carnegie Observatories, Pasadena.
In 1960, using the 200-inch (5-m) reflecting telescope, Sandage in collaboration with Thomas Matthews succeeded in making the first optical identification of a quasar or quasi-stellar object. Quasars first came to the notice of astronomers when a number of compact, rather than extended, radio sources were detected by the Cambridge surveys of the radio sky carried out in the 1950s. Sandage and Matthews showed that 3C–sp;48, a compact radio source discovered during the third Cambridge survey, was at the same position as a faint apparently starlike object. Sandage and others succeeded in obtaining spectra of 3C–sp;48 that were found to be quite unlike those of any other star. The mystery of these strange new objects was partially cleared up by Maarten Schmidt in 1963 when he showed that the spectral lines of a quasar have undergone an immense shift in wavelength.
Sandage continued to work on quasars and in 1965 introduced a method of identifying them by searching at an indicated radio position for objects emitting an excessive amount of ultraviolet or blue radiation. He found that many ultraviolet objects, which he named blue stellar objects or BSOs, were not radio emitters but could be still classed as quasars because they had the characteristic immense red shift first detected by Schmidt. He speculated that these might be older quasars that had passed beyond the radio phase of their life cycle. It is now known that the vast majority of quasars are not radio sources.

Scientists. . 2011.

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  • Sandage, Allan Rex — ▪ American astronomer born June 18, 1926, Iowa City, Iowa, U.S.       U.S. astronomer who discovered the first quasi stellar radio source (quasar), a starlike object that is a strong emitter of radio waves. He made the discovery in collaboration… …   Universalium

  • Allan Rex Sandage — Nombre Allan Rex Sandage Nacimiento 18 …   Wikipedia Español

  • Allan Rex Sandage — Allan Sandage Astéroïde découvert : 1 (96155) 1973 HA 27 avril 1973 Allan Rex Sandage (né le 18 juin 1926 à Iowa City dans l Iowa) est un astronome américain. Il fut diplômé de l université de l Illinois en 1948. En 1953, il obtint son Ph.D …   Wikipédia en Français

  • Allan Rex Sandage — (* 18. Juni 1926 in Iowa City, Iowa; † 13. November 2010 in San Gabriel, Kalifornien[1]) war ein US amerikanischer Astronom. Inhaltsverzeichnis 1 Leben und Karriere 2 Ehrungen …   Deutsch Wikipedia

  • Allan Sandage — Allan Rex Sandage (* 18. Juni 1926 in Iowa City, Iowa) ist ein US amerikanischer Astronom. Sandage studierte an der University of Illinois und am California Institute of Technology wo er sich ab 1949 als Student von Walter Baade mit… …   Deutsch Wikipedia

  • Sandage — Allan Rex Sandage (* 18. Juni 1926 in Iowa City, Iowa) ist ein US amerikanischer Astronom. Sandage studierte an der University of Illinois und am California Institute of Technology wo er sich ab 1949 als Student von Walter Baade mit… …   Deutsch Wikipedia

  • Allan Sandage — Allan Rex Sandage, né le 18 juin 1926 à Iowa City, Iowa (États Unis), et mort à San Gabriel (Californie) le 13 novembre 2010 d un cancer du pancréas[1], est un astronome américain. Sommaire 1 Biographie …   Wikipédia en Français

  • Allan Sandage — Infobox Scientist name = Allan Sandage box width = image width =150px caption = Allan Sandage birth date = June 18 1926 birth place = Iowa City, Iowa death date = death place = residence = citizenship = nationality = American ethnicity = field =… …   Wikipedia

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  • Brucemedaille — Die Catherine Wolfe Bruce gold medal oder kurz Bruce Medal ist eine jährliche Auszeichnung durch die Astronomical Society of the Pacific für herausragende Lebensleistungen für die Astronomie, gestiftet von der namensgebenden US amerikanischen… …   Deutsch Wikipedia

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