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This is an Einstein ring. It is the deformation of the light from a source (such as a galaxy or star) into a ring through gravitational lensing of the source’s light by an object with an extremely large mass (such as another galaxy, or a black hole). This occurs when the source, lens and observer are all aligned. 
The size of an Einstein ring is given by the Einstein radius. It is:

Where 
G is the gravitational constant
M is the mass of the lens
c is the speed of light
dL is the angular diameter distance to the lens
dS is the angular diameter distance to the source
dLS is the angular diameter distance between the lens and the source.
 
Photo Credit: ESA/Hubble & NASA

This is an Einstein ring. It is the deformation of the light from a source (such as a galaxy or star) into a ring through gravitational lensing of the source’s light by an object with an extremely large mass (such as another galaxy, or a black hole). This occurs when the source, lens and observer are all aligned. 

The size of an Einstein ring is given by the Einstein radius. It is:

Where 

  • G is the gravitational constant
  • M is the mass of the lens
  • c is the speed of light
  • dL is the angular diameter distance to the lens
  • dS is the angular diameter distance to the source
  • dLS is the angular diameter distance between the lens and the source.

 

Photo Credit: ESA/Hubble & NASA

(Source: kaleidoscopicmind)

2 years ago • 55 notes • January 25th
Tagged with Einstein Ring  Hubble  Astronomy  Science  
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