Astrometric Observation of MACHO Gravitational Microlensing

Details Astrometric Observation of MACHO Gravitational Microlensing Astrometric Observation of MACHO Gravitational Microlensing

1998-02-13

arxiv.org/abs/astro-ph/9802179v1

Astronomy and Astrophysics

Astrophysics

28 p, 12 fig, To appear in the ApJ

Scientific paper

10.1086/305913

Following previous suggestions of other researchers, this paper discusses the prospects for astrometric observation of MACHO gravitational microlensing events. We derive the expected astrometric observables for a simple microlensing event with either a dark or self-luminous lens, and demonstrate that accurate astrometry can determine the lens mass, distance, and proper motion in a very general fashion. In particular we argue that in limited circumstances ground-based, narrow-angle differential astrometric techniques are sufficient to measure the lens mass directly, and other lens properties (distance, transverse motion) by applying an independent model for the source distance and motion. We investigate the sensitivity of differential astrometry in determining lens parameters by Monte Carlo methods, and derive a quasi-empirical relationship between astrometric accuracy and mass uncertainty.

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