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dc.creatorGould, Andrew
dc.creatorSalim, Samir
dc.identifier.citationAndrew Gould and Samir Salim, "Photometric Microlens Parallaxes with the Space Interferometry Mission," The Astrophysical Journal 524, no. 2 (1999), doi:10.1086/307843en_US
dc.description.abstractAstrometric 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.en_US
dc.publisherAmerican Astronomical Societyen_US
dc.subjectGalaxy: stellar contenten_US
dc.subjectgravitational lensingen_US
dc.subjectMagellanic Cloudsen_US
dc.titlePhotometric Microlens Parallaxes with the Space Interferometry Missionen_US

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