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B1422+231 : the influence of mass substructure on strong lensingBradač, Maruša ...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.Vir: Astronomy & astrophysics. - ISSN 0004-6361 (388, 2002, str. 373-382)Vrsta gradiva - članek, sestavni delLeto - 2002Jezik - angleškiCOBISS.SI-ID - 15912456
Avtor
Bradač, Maruša |
Schneider, Peter, 1958- |
Steinmetz, Matthias |
Lombardi, Marco |
King, Lindsay J. |
Porcas, Richard
Teme
fizika |
astrofizika |
kozmologija |
galaksije |
gravitacija |
sistemi leč |
gravitacijske leče |
teleskopi |
physics |
astrophysics |
cosmology |
dark matter |
galaxies |
gravitational lensing
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Baze podatkov, v katerih je revija indeksirana
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Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
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Bradač, Maruša | 91144 |
Schneider, Peter, 1958- | ![]() |
Steinmetz, Matthias | ![]() |
Lombardi, Marco | ![]() |
King, Lindsay J. | ![]() |
Porcas, Richard | ![]() |
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