2001/04/25 by Prasenjit Saha, Liliya L. R. Williams · 3 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Electrical and Electromagnetic Research #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.1086/321151
To appear in AJ (circa Aug 2001)
arxiv created 2001/04/25 · openalex publication_date 2001/08/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We explain how an approximation to the rings formed by the host galaxies in lensed QSOs can be inferred from the QSO data alone. A simple ring image can be made from any lens model by a simple piece of computer graphics: just plot a contour map of the arrival-time surface with closely spaced contours. We go on to explain that rings should be (1) sensitive to time-delay ratios between different pairs of images, but (2) very insensitive to H 0 . We illustrate this for the well-known quadruple lenses 1115+080 and 1608+656.