Is the Large Magellanic Cloud Microlensing Due to an Intervening Dwarf Galaxy?
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The recent suggestion that the microlensing events observed towards the Large
Magellanic Cloud are due to an intervening Sgr-like dwarf galaxy is examined. A
search for foreground RR Lyrae in the MACHO photometry database yields 20 stars
whose distance distribution follow the expected halo density profile. Cepheid
and red giant branch clump stars in the MACHO database are consistent with
membership in the LMC. There is also no evidence in the literature for a
distinct kinematic population, for intervening gas, or for the turn-off of such
a hypothetical galaxy. We conclude that if the lenses are in a foreground
galaxy, it must be a particularly dark galaxy.
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