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| Paper IPM / Physic / 7632 |
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| Abstract: | |
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The gravitational microlensing experiments in the direction of
Large Magellanic Cloud (LMC) predict a large amount of white
dwarfs ( ∼ 20%) filling the galactic halo. However, the
predicted white dwarfs have not been observed at the galactic
halo. To interpret the microlensing results and resolving the
mentioned problems, we use the hypothesis of spatially varying
mass function of MACHOs, proposed by [] (hereafter KE).
However the KE model is not compatible with the duration
distribution of events []. Here we use more realistic
power-law model of MF, dn/dm ∝ mα for the MACHOs of
halo. The index of MF in this model changes from −2.7 for stars
with m > 1 M\bigodot at the central part of galactic halo to
the substellar regime with an upper limit of −1 at the edge of
halo. We show that in contrast to the abundant brown dwarfs of
galactic halo, heavy MACHOs can be responsible for the
microlensing events in the direction of LMC.
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