Other
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444..556g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 444, no. 2, p. 556-560
Other
12
Astrometry, Gravitational Lenses, Parallax, Quasars, Spiral Galaxies, Velocity Measurement, Background Radiation, Light Curve, Mass To Light Ratios, Radial Velocity, Red Shift, Velocity Distribution
Scientific paper
The transverse velocity of a spiral galaxy can be measured to an accuracy approximately 60 km/s by making parallax observations of quasars being microlensed by stars in the disk of the galaxy. To make the measurement, a quasar must be located behind the disk of the galaxy between about 1 and 2 scale lengths from the center. The quasar must then be monitored for microlensing events and the events followed simultaneously from the Earth and a satellite in solar orbit, preferably at approximately 30 AU. A systematic search in a volume within 21,000 km/s could locate quasars with B is less than 23 behind a total of approximately 1900 galaxies. The rate of lensing events (and hence galaxy velocity measurements) would be approximately 3/yr. The events would have typical characteristic times 1/omega approximately 3 yr. Under the assumption that the mass spectrum of lensing objects is the same in other spiral galaxies as our own, the observations could be used to measure the Hubble parameter to an accuracy of 5%.
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