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News Release 54 of 122

November 17, 2005 01:00 PM (EST)

News Release Number: STScI-2005-32

Hubble, Sloan Quadruple Number of Known Optical Einstein Rings

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Image: A Gallery of Einstein Rings

A Gallery of Einstein RingsSTScI-PRC2005-32

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ABOUT THIS IMAGE:

The thin blue bull's-eye patterns in these eight Hubble Space Telescope images appear like neon signs floating over reddish-white blobs. The blobs are giant elliptical galaxies roughly 2 to 4 billion light-years away. The bull's-eye patterns are created as the light from galaxies twice as far away is distorted into circular shapes by the gravity of the giant elliptical galaxies. This phenomenon is called gravitational lensing, first predicted by Albert Einstein almost a century ago. Gravitational lensing occurs when the gravitational field from a massive object warps space and deflects light from a distant object behind it.

The bull's-eye patterns are so-called "Einstein rings," which are the most elegant manifestation of the lensing phenomenon. Einstein rings are produced when two galaxies are almost perfectly aligned, one behind the other.

The images were taken between August 2004 and March 2005 by the Hubble telescope's Advanced Camera for Surveys. They are part of an ongoing survey, called the Sloan Lens ACS (or SLACS) Survey, of about 150 galaxies to hunt for gravitational lenses. So far, the survey has netted 19 new gravitational lenses, adding significantly to the 100 or so previously known lenses. The survey also has identified eight new Einstein rings. Only three such rings had been seen previously in visible light.

Image Type: Astronomical/Annotated

Credit: NASA, ESA, and the SLACS Survey team: A. Bolton (Harvard/ Smithsonian), S. Burles (MIT), L. Koopmans (Kapteyn), T. Treu (UCSB), and L. Moustakas (JPL/Caltech)

NEWS RELEASE IMAGES

The above montage includes these images:

Einstein Ring Gravitational Lens (SDSS J073728.45+321618.5) Image Type: Astronomical Einstein Ring Gravitational Lens (SDSS J073728.45+321618.5) Einstein Ring Gravitational Lens (SDSS J095629.77+510006.6) Image Type: Astronomical Einstein Ring Gravitational Lens (SDSS J095629.77+510006.6) Einstein Ring Gravitational Lens (SDSS J120540.43+491029.3) Image Type: Astronomical Einstein Ring Gravitational Lens (SDSS J120540.43+491029.3) Einstein Ring Gravitational Lens (SDSS J125028.25+052349.0) Image Type: Astronomical Einstein Ring Gravitational Lens (SDSS J125028.25+052349.0) Einstein Ring Gravitational Lens (SDSS J140228.21+632133.5) Image Type: Astronomical Einstein Ring Gravitational Lens (SDSS J140228.21+632133.5) Einstein Ring Gravitational Lens (SDSS J162746.44-005357.5) Image Type: Astronomical Einstein Ring Gravitational Lens (SDSS J162746.44-005357.5) Einstein Ring Gravitational Lens (SDSS J163028.15+452036.2) Image Type: Astronomical Einstein Ring Gravitational Lens (SDSS J163028.15+452036.2) Einstein Ring Gravitational Lens (SDSS J232120.93-093910.2) Image Type: Astronomical Einstein Ring Gravitational Lens (SDSS J232120.93-093910.2)

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