physics4me

physicsgg

A Horseshoe Einstein Ring from Hubble

with 3 comments

 Explanation: What’s large and blue and can wrap itself around an entire galaxy? A gravitational lens mirage. Pictured above, the gravity of a luminous red galaxy (LRG) has gravitationally distorted the light from a much more distant blue galaxy.
More typically, such light bending results in two discernible images of the distant galaxy, but here the lens alignment is so precise that the background galaxy is distorted into a horseshoe — a nearly complete ring.
Since such a lensing effect was generally predicted in some detail by Albert Einstein over 70 years ago, rings like this are now known as Einstein Rings. Although LRG 3-757 was discovered in 2007 in data from the Sloan Digital Sky Survey (SDSS), the image shown above is a follow-up observation taken with the Hubble Space Telescope’s Wide Field Camera 3. Strong gravitational lenses like LRG 3-757 are more than oddities — their multiple properties allow astronomers to determine the mass and dark matter content of the foreground galaxy lenses….

Read more: apod.nasa.gov

Written by physicsgg

December 22, 2011 at 2:28 pm

3 Responses

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  1. These images always awe me. Just beautiful.

    krismerino

    December 22, 2011 at 4:07 pm

  2. When I saw the pic I thought it was a ring galaxy formation, but gravitational lensing is far more interesting – if not as naturally beautiful.

    Neural Outlet..

    December 22, 2011 at 10:10 pm

  3. There’s a ring section offset—would that be an indication of a merging blob of dark matter…?

    Mr. Raymond Kenneth Petry

    February 8, 2015 at 1:06 am


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