Central images in gravitational lenses probe the matter profiles in the inner 100 pc of the lens galaxies, providing information on galactic structure at cosmological distances (z ∼ 0.5). We present Very Long Baseline Array and High Sensitivity Array observations of J1838-3427, B0739+366, B1152+199, B0445+123 and B0850+054: 5 gravitational lenses that are good central image candidates. We model the mass profiles of the lens galaxies, finding that the limits on the central image flux densities imply near-isothermal central profiles. Galaxy centers are steeper than pure dark matter haloes.This work was partly supported by National Science Foundation grant AST 00-71181. Work by E. R. B. was partly supported by the pre-doctoral fellowship program of the National Radio Astronomy Observatory, a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Work by J. N. W. was supported by NASA through Hubble Fellowship grant HST-HF-01180.02-A, awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555.
American Astronomical Society Meeting Abstracts
- Pub Date:
- December 2005