Quasar Image Shifts due to Gravitational Microlensing

Details Quasar Image Shifts due to Gravitational Microlensing Quasar Image Shifts due to Gravitational Microlensing

1998-02-23

arxiv.org/abs/astro-ph/9802297v1

Astrophys.J. 501 (1998) 478

Astronomy and Astrophysics

Astrophysics

16 Pages, 4 Figures. Accepted for publication in The Astrophysical Journal

Scientific paper

10.1086/305860

Gravitational microlensing of quasars by stars in external galaxies can introduce fluctuations in the centroid of the ``point-like'' macro--images. The induced shifts are extremely small, on micro--arcsecond scales, below the limits of current optical observations. However, such shifts will become measurable with the proposed ``Space Interferometry'' mission, due to fly in 2005. The degree of the centroid shifts and their application as probes of both quasar structure and the stellar mass function in the lensing galaxy are discussed.

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