Photometric Microlens Parallaxes with the Space Interferometry Mission

Details Photometric Microlens Parallaxes with the Space Interferometry Mission Photometric Microlens Parallaxes with the Space Interferometry Mission

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...524..794g&link_type=abstract

The Astrophysical Journal, Volume 524, Issue 2, pp. 794-804.

Astronomy and Astrophysics

Astronomy

33

Astrometry, Galaxy: Stellar Content, Cosmology: Gravitational Lensing, Galaxies: Magellanic Clouds

Scientific paper

Astrometric measurements of microlensing events can in principle determine both the ``parallax'' r_E and the ``proper motion'' μ of an individual event, which (combined with the Einstein timescale t_E) in turn yield the mass, distance, and transverse velocity of the lens. We show, however, that the parallax measurements are generically several orders of magnitude less precise than the proper-motion measurements. Fortunately, astrometric measurements by the Space Interferometry Mission (SIM) are simultaneously photometric measurements, and since SIM will be in solar orbit, these allow SIM to be used as a classical (photometric) parallax satellite. We show that SIM photometric parallaxes are of precision comparable to that of its astrometric proper-motion measurements. For I=15 bulge stars, complete solutions with ~5% accuracy in mass, distance, and transverse velocity can be obtained from about 5 hr of observation, 100-10,000 times shorter than would be required for a purely astrometric solution of similar precision. Thus, it should be possible to measure directly the mass functions of both the bulge and the inner disk (including both dark and luminous objects) with only a few hundred hours of SIM observations.

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