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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
general
An unusually strong Einstein ring in the radio source PKS1830-211
Nature, Volume 352, No. 6331, Year 1991
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Description
RADIO observations of the strong, flat-spectrum radio source PKS1830-211 revealed a double structure, with a separation of 1 arcsec, suggesting that it might be a gravitationally lensed object1. We have now obtained high-resolution radio images of PKS1830-211 from several interferometric radiotelescope networks, which show an unusual elliptical ring-like structure connecting the two brighter components. The presence of the ring, and the similarity of the two brighter spots, argue strongly that this is indeed a gravitationally lensed system, specifically an Einstein ring in which lens and lensed object are closely aligned. Although the source is close to the galactic plane, it seems that both the lens and background (lensed) object are extragalactic. This object is one hundred times brighter than either of the two previously discovered radio Einstein rings, and is among the six brightest flat-spectrum sources in the sky. Its brightness makes it a peculiar object: it must involve either a chance alignment of a lensing object with an unusually bright background source, or an alignment with a less bright object but amplified to an unusual degree. © 1991 Nature Publishing Group.
Authors & Co-Authors
Jauncey, David L.
Australia, Sydney
Australia Telescope National Facility
Reynolds, John E.
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Tzioumis, Anastasios K.
United Kingdom, Macclesfield
Nuffield Radio Astronomy Laboratories
Muxlow, Thomas W.B.
United Kingdom, Macclesfield
Nuffield Radio Astronomy Laboratories
Perley, Richard A.
United States, Socorro
National Radio Astronomy Observatory Socorro
Murphy, David W.
United States, Pasadena
Jet Propulsion Laboratory
Preston, Robert A.
United States, Pasadena
Jet Propulsion Laboratory
King, E. A.
Australia, Hobart
University of Tasmania
Patnaik, Alok Ranjan
United Kingdom, Macclesfield
Nuffield Radio Astronomy Laboratories
Jones, Dayton L.
United States, Pasadena
Jet Propulsion Laboratory
Meier, David L.
United States, Pasadena
Jet Propulsion Laboratory
Bird, D. J.
Australia, Adelaide
The University of Adelaide
Blair, David Gerald
Australia, Perth
The University of Western Australia
Bunton, John D.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Clay, Roger W.
Australia, Adelaide
The University of Adelaide
Costa, Marco E.
Australia, Perth
The University of Western Australia
Duncan, R. A.
Australia, Sydney
Australia Telescope National Facility
Ferris, Richard H.
Australia, Sydney
Australia Telescope National Facility
Gough, Russell G.
Australia, Sydney
Australia Telescope National Facility
Hamilton, P. A.
Australia, Hobart
University of Tasmania
Hoard, D. W.
United States, Pasadena
Jet Propulsion Laboratory
Kemball, Athol J.
South Africa, Krugersdorp
Hartebeesthoek Radio Astronomy Observatory
Kesteven, Michael J.L.
Australia, Sydney
Australia Telescope National Facility
Lobdell, E. T.
United States, Pasadena
Jet Propulsion Laboratory
Lurten, A. N.
Australia, Perth
The University of Western Australia
McCulloch, Peter M.
Australia, Hobart
University of Tasmania
Nicolson, George D.
South Africa, Krugersdorp
Hartebeesthoek Radio Astronomy Observatory
Rao, A. Pramesh
India, Mumbai
Tata Institute of Fundamental Research, Mumbai
Savage, Ann
Australia, Eastwood
Anglo Australian Observatory
Sinclair, Malcolm W.
Australia, Sydney
Australia Telescope National Facility
Skjerve, Lyle J.
United States, Pasadena
Jet Propulsion Laboratory
Taaffe, L.
Australia, Adelaide
The University of Adelaide
Wark, Robin M.
Australia, Sydney
Australia Telescope National Facility
White, Graeme L.
Australia, Sydney
Australia Telescope National Facility
Statistics
Citations: 97
Authors: 34
Affiliations: 12
Identifiers
Doi:
10.1038/352132a0
ISSN:
00280836