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Date and Time of the Query: 2019-03-18 T09:57:17 PDT
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For refcode 2003ApJ...582...17K:
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2003ApJ...582...17K Lensing and the Centers of Distant Early-Type Galaxies Charles R. Keeton Astronomy and Astrophysics Department, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 Received 2002 May 22; accepted 2002 September 3 ABSTRACT Gravitational lensing provides a unique probe of the inner 10-1000 pc of distant galaxies (z ~ 0.2-1). Theoretical studies have predicted that each strong lens system should have a faint image near the center of the lens galaxy, which should, in principle, be visible in radio lenses but has never been detected. We study the predicted "core" images using models derived from the stellar distributions in nearby early-type galaxies. We find that realistic lens galaxies produce a remarkably wide range of core images, with magnifications spanning some 6 orders of magnitude. More concentrated galaxies produce fainter core images, although not with any model-independent relation between the galaxy properties and the core images. Some real galaxies have diffuse cores that should yield bright core images (magnification {mu}_core_ >~ 0.1), but more common are galaxies that yield faint core images ({mu}_core_ <~ 0.001). Thus, stellar mass distributions alone are probably concentrated enough to explain the lack of observed core images. Observational sensitivity may need to improve by an order of magnitude before detections of core images become common. Two-image lenses should tend to have brighter core images than four-image lenses, so they will be the better targets for finding core images and exploiting these tools for studying the central mass distributions of distant galaxies. Subject headings: galaxies: elliptical and lenticular, cD - galaxies: nuclei - galaxies: structure - gravitational lensing
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