Prospects for MACHO masses from combined photometric and astrometric observations

Details Prospects for MACHO masses from combined photometric and astrometric observations Prospects for MACHO masses from combined photometric and astrometric observations

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998newar..42..111b&link_type=abstract

New Astronomy Reviews, Volume 42, Issue 2, p. 111-114.

Astronomy and Astrophysics

Astronomy

Scientific paper

In current microlensing observations, the mass of the lens is not determined directly but is folded in with the distance to the lens, and the proper motion of the source. This degeneracy is partly lifted in parallax-shifted events where the Earth's acceleration affects the photometry. There are proposals to lift this degeneracy completely using satellite data. Another possibility is to combine accurate photometry with centroid measurements. Using this method, it was found that for a 0.1M_solar lens, if the photometry is performed to 0.2% and the astrometry to 0.2 milli-arcseconds (1sigma Gaussian errors), the mass can be recovered to +/-25% at 90% confidence. This is difficult but not inconceivable from ground-based observatories.

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