Unusual radio source MG1131+0456 - A possible Einstein ring

Details Unusual radio source MG1131+0456 - A possible Einstein ring Unusual radio source MG1131+0456 - A possible Einstein ring

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.333..537h&link_type=abstract

Nature (ISSN 0028-0836), vol. 333, June 9, 1988, p. 537-540. NSF-NASA-supported research.

Astronomy and Astrophysics

Astronomy

97

Extragalactic Radio Sources, Gravitational Lenses, Radio Galaxies, Gravitational Fields, Infrared Sources (Astronomy), Very Large Array (Vla)

Scientific paper

The discovery of extremely unusual structure in the radio source MG1131+0456 is reported. In a radio map with subsarcsecond resolution the object appears as an elliptical ring of emission accompanied by a pair of more compact sources, nearly diametrically opposed and offset by about 0.3 arcsec to the southwest of the ring. There is a faint, slightly extended, optical counterpart. A continuum but no emission lines is detected in its spectrum; therefore, the redshift of the counterpart is unknown. The radio morphology suggests that this source may be an example of an 'Einstein ring', a highly symmetric case of gravitational lensing in which the source is imaged into a ring. Other explanations are considered and excluded by the data. Another possibility is that MG1131+04565 represents a new type of astronomical object.

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