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



ID: 11051.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
B1422+231 : The influence of mass substructure on strong lensing
Authors:Bradac, M.; Schneider, P.; Steinmetz, M.; Lombardi, M.; King, L. J.; Porcas, R.
Language:English
Date of Publication (YYYY-MM-DD):2002-06
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Volume:388
Issue / Number:2
Start Page:373
End Page:382
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:In this work we investigate the gravitationally lensed system B1422+231. High-quality VLBI image positions, fluxes and shapes as well as an optical HST lens galaxy position are used. First, two simple and smooth models for the lens galaxy are applied to fit observed image positions and fluxes; no even remotely acceptable model was found. Such models also do not accurately reproduce the image shapes. In order to fit the data successfully, mass substructure has to be added to the lens, and its level is estimated. To explore expectations about the level of substructure in galaxies and its influence on strong lensing, N-body simulation results of a model galaxy are employed. By using the mass distribution of this model galaxy as a lens, synthetic data sets of different four image system configurations are generated and simple lens models are again applied to fit them. The difficulties in fitting these lens systems turn out to be similar to the case of some real gravitationally lensed systems, thus possibly providing evidence for the presence and strong influence of substructure in the primary lens galaxy.
Free Keywords:cosmology : dark matter; galaxies : structure; gravitational lensing
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Inst Astrophys & Extraterr Forsch, Auf Hugel 71, D-53121 Bonn,; Germany; Inst Astrophys & Extraterr Forsch, D-53121 Bonn, Germany; Univ Arizona, Steward Observ, Tucson, AZ 85721 USA; Max Planck Inst Astrophys, D-85748 Garching, Germany; Max Planck Inst Radioastron, D-53121 Bonn, Germany
Identifiers:ISI:000176100000008
ISSN:0004-6361
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