Improper Motions in Lensed QSOs
Astrophysics
2009-10-28 v1
Abstract
We argue that individual images in multiple-image QSOs could easily have substructure at the level of (i.e., unresolvable even with HST); microlensing within such substructure would cause centroid shifts, observable even from the ground as pseudo proper motions. We present a model of the four-image system 2237+0305 in which Image B shows such ``improper motions" of order of over a few years.
Cite
@article{arxiv.astro-ph/9508095,
title = {Improper Motions in Lensed QSOs},
author = {L. L. R. Williams and P. Saha},
journal= {arXiv preprint arXiv:astro-ph/9508095},
year = {2009}
}
Comments
16 pages, uuencoded, to appear in the Astronomical Journal