Einstein Ring 4C 05.51

https://www.nrao.edu/archives/plugins/Dropbox/files/EinsteinRing_VR83_hi.jpg

Description

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.

Creator

Legacy Astronomical Images

Rights

NRAO/AUI/NSF does not hold full copyright for this image. Contact the archivist for details.

Type

Legacy Astronomical Image

Object Name

4C 05.51

Investigators

J.N. Hewitt, E.L. Turner

Telescope

Very Large Array (VLA)

Observation Date

1987-09-20

Type of Observation

continuum

Band

U

Wavelength

2.0 cm

Frequency

15 GHz

Center of Image

RA 11:31:56.470, Dec: 4:55:48.800 (J2000)

Field of View

0.001400 x 0.001400 degrees

Notes

Contact the archivist for a high resolution tif of this image.

Series

Miscellaneous Series

Unit

Cosmology Unit

Citation

Legacy Astronomical Images, “Einstein Ring 4C 05.51,” NRAO Archives, accessed June 17, 2021, https://www.nrao.edu/archives/items/show/33593.