Einstein Ring 4C 05.51
This radio source, 4C 05.51, has extremely unusual structure: a smooth low-surface brightness ring accompanied by two nearly diametrically opposed-compact sources, both offset to the southwest; The optical and radio spectral properties appear inconsistent with a Supernova Remnant or an HII Region, astronomical systems that sometimes display ring-like structure. The structure strongly suggests that it is due to gravitational lensing, by a foreground massive object of light from a Quasar or Radio Galaxy. If this is the case, then this object represents an "Einstein Ring", a particularly symmetric case of gravitational lensing first proposed by Einstein in 1936, in which the source is imaged into a ring. Further observations are being carried out to test the lens hypothesis.
VLA in A-configuration using 26 antennas.
Legacy Astronomical Images
NRAO/AUI/NSF does not hold full copyright for this image. Contact the archivist for details.
Legacy Astronomical Image
J.N. Hewitt, E.L. Turner
Very Large Array (VLA)
Type of Observation
Center of Image
RA 11:31:56.470, Dec: 4:55:48.800 (J2000)
Field of View
0.001400 x 0.001400 degrees
Contact the archivist for a high resolution tif of this image.
Legacy Astronomical Images, “Einstein Ring 4C 05.51,” NRAO Archives, accessed June 17, 2021, https://www.nrao.edu/archives/items/show/33593.