PKS 1830-211: A possible compound gravitational lens

被引：54
|
作者：
Lovell, JEJ
Reynolds, JE
Jauncey, DL
Backus, PR
McCulloch, PM
Sinclair, MW
Wilson, WE
Tzioumis, AK
King, EA
Gough, RG
Ellingsen, SP
Phillips, CJ
Preston, RA
Jones, DL
机构：
[1] CSIRO,AUSTRALIA TELESCOPE NATL FACIL,EPPING,NSW 2121,AUSTRALIA
[2] SETI INST,MOUNTAIN VIEW,CA 94043
[3] CALTECH,JET PROP LAB,PASADENA,CA 91109
来源：
ASTROPHYSICAL JOURNAL | 1996年 / 472卷 / 01期
关键词：
galaxies; distances and redshifts; individual; (PKS; 1830-211); gravitational lensing;
D O I：
10.1086/310353
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
引用
收藏
页码：L5 / L7
页数：3
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