Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.astronet.ru/db/xware/msg/1165106
Дата изменения: Thu Apr 24 17:13:19 2003
Дата индексирования: Tue Oct 2 18:27:12 2012
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Microlensing of the Einstein Cross
Astronomy Picture of the Day
    


Microlensing of the Einstein Cross
<< Yesterday 15.12.1996 Tomorrow >>
Microlensing of the Einstein Cross
Credit & Copyright: G. Lewis (IOA), M. Irwin (RGO), William Hershel Telescope
Explanation: The famous "Einstein Cross" is a case where a single object is seen four times. Here a very distant QSO happened to be placed right behind a massive galaxy. The gravitational effect of the galaxy on the distant QSO was similar to the lens effect of an empty wine glass on a distant street light - it created multiple images. But stars in the foreground galaxy have been found to act as gravitational lenses here too! These stars make the images change brightness relative to each other. These brightness changes are visible on these two photographs of the Einstein Cross, taken about 3 years apart.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: microlensing - Einstein cross
Publications with words: microlensing - Einstein cross
See also: