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PKS 1830-211: A Possible Compound Gravitational Lens


Lovell, JEJ and Reynolds, JE and Jauncey, DL and Backus, PR and McCulloch, PM and Sinclair, MW and Wilson, WE and Tzioumis, AK and King, EA and Gough, RG and Ellingsen, SP and Phillips, CJ and Preston, RA and Jones, DL, PKS 1830-211: A Possible Compound Gravitational Lens, The Astrophysical Journal, 472, (1) pp. L5-L7. ISSN 0004-637X (1996) [Refereed Article]

DOI: doi:10.1086/310353


Measurements of the properties of gravitational lenses have the power to tell us what sort of universe we live in. The brightest known radio Einstein ring/gravitational lens PKS 1830-211, while obscured by our Galaxy at optical wavelengths, has recently been shown to contain absorption at the millimeter waveband at a redshift of 0.89. We report the detection of a new absorption feature, most likely due to neutral hydrogen in a second redshift system at z = 0.19. Follow-up VLBI observations have spatially resolved the absorption and reveal it to cover the NE compact component and part of the lower surface brightness ring. This new information, together with existing evidence of the unusual VLBI radio structure and difficulties in modeling the lensing system, points to the existence of a second lensing galaxy along our line of sight and implies that PKS 1830-211 may be a compound gravitational lens. © 1996. The American Astronomical Society. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
UTAS Author:McCulloch, PM (Professor Peter McCulloch)
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
UTAS Author:Phillips, CJ (Dr Christopher Phillips)
ID Code:357
Year Published:1996
Web of Science® Times Cited:50
Deposited By:Physics
Deposited On:1996-08-01
Last Modified:2011-08-16

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