Einstein cross


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Einstein cross

(ÿn -stÿn) A gravitationally-lensed image of a distant quasar (redshift 1.7) by a foreground (redshift 0.039) spiral galaxy. The image of the quasar is split into four point sources forming a cross at the center of the galaxy. Gravitational microlensing has been observed as variations in the light between the four components. See gravitational lens.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
"The results showed that one of the blackholes, in the lensed quasar called the Einstein Cross, is spinning at or almost at the maximum rate possible," said the Phys Org.
The result is a classic Einstein Cross (shown), the first ever for a Type la supernova.
Named the Refsdal supernova in honour of Norwegian scientist Sjur Refsdal, the first scientist to propose the use of time-delayed images from galaxies undergoing gravitational lensing to study the universe's expansion, the explosion occurred 10 billion years ago, and was first observed by Hubble in November 2014, in four separate images taken around the Einstein Cross, a rare, distant galactic arrangement in outer space.
Munich, Dec 13 (ANI): Astronomers have used the ESO's (European Southern Observatory's) Very Large Telescope, along with a double natural "magnifying glass" known as the "Einstein Cross", to scrutinize the inner parts of the disc around a supermassive black hole 10 billion light years away.
The "Einstein Cross", a famous cosmic mirage, is a cross-shaped configuration consisting of four images of a single very distant source.
The light source in the Einstein Cross is a quasar approximately ten billion light-years away, whereas the foreground lensing galaxy is ten times closer.
"The combination of this natural magnification with the use of a big telescope provides us with the sharpest details ever obtained," explained Frederic Courbin, leader of the programme studying the Einstein Cross with ESO's Very Large Telescope.
Yet we go on about them like they're Mozart crossed with Einstein crossed with Florence Nightingale.
Until now, such Einstein crosses have always involved background quasars.
Einstein crosses occur when the mass of the lensing body isn't distributed evenly throughout space.