Effect of Large-Scale Structure on Multiply Imaged Sources
1996; IOP Publishing; Volume: 468; Linguagem: Inglês
10.1086/177666
ISSN1538-4357
Autores Tópico(s)Pulsars and Gravitational Waves Research
Resumoview Abstract Citations (90) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Effect of Large-Scale Structure on Multiply Imaged Sources Bar-Kana, Rennan Abstract We study the effects of large-scale density fluctuations on strong gravitational lensing. Previous studies have focused mostly on weak lensing, since large-scale structure alone cannot produce multiple images. When a galaxy or cluster acts as a primary lens, however, we find that large-scale structure can produce asymmetric shear of the same order as the lens itself. Indeed, this may explain the origin of the large shear found in lens models in conflict with the small ellipticity of the observed galaxy light distributions. We show that large-scale structure changes the lens equation to the form of a generalized quadrupole lens, which affects lens reconstruction. Large-scale structure also changes the angular diameter distance at a given redshift. The precise value depends on the lens and source redshifts and on the large-scale structure power spectrum, but the induced 1 σ uncertainty in determinations of the Hubble constant from measurements of time delays is of order 5%-10%. If observations of lensing can constrain the magnitude of the shear which is due to large-scale structure, this would provide a direct probe of the overall amplitude of mass fluctuations. Publication: The Astrophysical Journal Pub Date: September 1996 DOI: 10.1086/177666 arXiv: arXiv:astro-ph/9511056 Bibcode: 1996ApJ...468...17B Keywords: COSMOLOGY: GRAVITATIONAL LENSING; COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE; Astrophysics E-Print: Latex, 20 pages, 3 PostScript figures, to appear in ApJ Sept. 10, 1996, substantially revised full text sources arXiv | ADS |
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