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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents



ID: 125359.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Changes in the measured image separation of the gravitational lens system PKS 1830-211
Authors:Jin, C.; Garrett, M. A.; Nair, S.; Porcas, R. W.; Patnaik, A. R.; Nan, R.
Language:English
Date of Publication (YYYY-MM-DD):2003-04-21
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. Roy. Astron. Soc.
Volume:340
Issue / Number:4
Start Page:1309
End Page:1316
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present eight epochs of 43-GHz, dual-polarization VLBA observations of the gravitational lens system PKS 1830-211, made over fourteen weeks. A bright, compact 'core' and a faint extended 'jet' are clearly seen in maps of both lensed images at all eight epochs. The relative separation of the radio centroid of the cores (as measured on the sky) changes by up to 87 mu as between subsequent epochs. A comparison with the previous 43-GHz VLBA observations made 8 months earlier shows even larger deviations in the separation of up to 201 muas. The measured changes are most likely produced by changes in the brightness distribution of the background source, enhanced by the magnification of the lens. A relative magnification matrix that is applicable on the milliarcsecond scale has been determined by relating two vectors (the 'core-jet' separations and the offsets of the polarized and total intensity emission) in the two lensed images. The determinant of this matrix, -1.13 (+/-0.61), is in good agreement with the measured flux density ratio of the two images. The matrix predicts that the 10-mas-long jet, which is clearly seen in previous 15- and 8.4-GHz VLBA observations, should correspond to a 4-mas-long jet trailing to the south-east of the south-western image. The clear non-detection of this trailing jet is a strong evidence for substructure in the lens and may require more realistic lens models to be invoked, such as that of Nair Garrett.
Free Keywords:gravitational lensing, methods : data analysis, techniques : image processing
Comment of the Author/Creator:Date: 2003, APR 21
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China.; Joint Inst VLBI Europe, NL-7990 AA Dwingeloo, Netherlands.; Raman Res Inst, Bangalore 560080, Karnataka, India.; Max Planck Inst Radioastron, D-53121 Bonn, Germany.
Identifiers:ISI:000182118200025 [ID No:1]
ISSN:0035-8711 [ID No:2]
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