Einstein Ring Gravitational Lens: SDSS J232120.93-093910.2

This object is named SDSS J232120.93-093910.2. It is one of eight similar objects found by combining two powerful astronomical assets, the Sloan Digital Sky Survey (SDSS) and NASA's Hubble Space Telescope.

The objects are know as ‘Eienstein rings’ and are perhaps the most elegant manifestations of the gravitational lensing phenomina. Gravitational lensing occurs when the gravitational field from a massive object warps space and deflects light from a distant object behind it, allowing the distant object to be seen. Einstein rings are produced when two galaxies are almost perfectly aligned, one behind the other, giving an image like this with a reddish-white elliptical galaxy in the foreground and a thin ring of blue surrounding it — which is in fact the distorted light from another galaxy twice as far away.

Credit:

NASA, ESA, A. Bolton (Harvard-Smithsonian CfA) and the SLACS Team

About the Image

NASA press release
NASA caption
Id:opo0532i
Type:Observation
Release date:17 November 2005, 19:00
Size:723 x 723 px

About the Object

Name:SDSS J232120.93-093910.2
Type:Early Universe : Galaxy : Type : Gravitationally Lensed
Distance:z=0.081 (redshift)
Constellation:Aquarius
Category:Cosmology
Galaxies

Image Formats

Large JPEG
99.0 KB
Screensize JPEG
102.5 KB

Wallpapers

1024x768
131.6 KB
1280x1024
193.4 KB
1600x1200
255.3 KB
1920x1200
295.7 KB
2048x1536
350.5 KB

Coordinates

Position (RA):23 21 20.95
Position (Dec):-9° 39' 9.57"
Field of view:0.14 x 0.14 arcminutes
Orientation:North is -0.0° left of vertical

Colours & filters

BandWavelengthTelescope
Optical
B
435 nm Hubble Space Telescope
ACS
Infrared
I
814 nm Hubble Space Telescope
ACS

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