Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-05-29
Astronomy and Astrophysics
Astrophysics
17 pages (including 8 figures), uuencoded gz-compressed postscript
Scientific paper
We investigated the dependence of the optical depth $\tau$ of the microlensing events on model parameters of the Galactic halo. We only consider Galactic mass models in which the rotation curve inside the Sun is compatible with the observation and LMC is bound to the Galaxy. It is found that $\tau$ varies up to a factor 2.5 from the standard spherical and flat rotation halo model. This implies that only the most centrally concentrated halo model can be consistent with the observation if the halo consists of only MACHOs. We also calculate the power $x$ of IMF of MACHO consistent with Tyson's CCD survey as well as Bahcall \etal's observation by {\em HST}. It is found that $x$ is greater than 5.
Kan-ya Yukitoshi
Nakamura Takashi
Nishi Ryoichi
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