Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404..451g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 2, p. 451-454.
Astronomy and Astrophysics
Astrophysics
31
Galactic Halos, Gravitational Lenses, Magellanic Clouds, Dark Matter, Optical Thickness
Scientific paper
If galactic halos are composed of massive compact halo objects (MACHOs) in the mass range M less than about 0.01 M(solar), then ongoing gravitational lensing experiments could be capable of detecting them in the Large Magellanic Cloud (LMC). The signature of LMC (as opposed to Galactic) MACHOs is a variation of the optical depth to lensing as a function of sky position. Assuming that the LMC halo is spherical, the optical depth along lines of sight toward the far side of the LMC disk should be about 20 percent higher than those toward the near side because the former pass through more of the halo. If the LMC halo is oblate, the effect is diminished as the square of the halo flatness ratio. The amplitude of the spatial variation in the lensing rate can therefore provide information about the flattening of the LMC halo.
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