Improper motions in lensed QSOs

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15 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1471-1475
Number of pages5
JournalAstronomical Journal
Issue number4
StatePublished - Oct 1995
Externally publishedYes


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