Improper Motions in Lensed QSOs

Details Improper Motions in Lensed QSOs Improper Motions in Lensed QSOs

1995-08-21

arxiv.org/abs/astro-ph/9508095v1

Astron.J. 110 (1995) 1471

Astronomy and Astrophysics

Astrophysics

16 pages, uuencoded, to appear in the Astronomical Journal

Scientific paper

10.1086/117620

We argue that individual images in multiple-image QSOs could easily have substructure at the level of $0.1''$ (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 $0.01''$ over a few years.

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