Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-03-08
Astrophys.J. 471 (1996) 64
Astronomy and Astrophysics
Astrophysics
10 pages; LaTeX. one figure available upon request to deholz@rainbow.uchicago.edu. REVISED: Error in impact parameter distribu
Scientific paper
10.1086/177953
We analyze the limitations imposed by photon counting statistics on extracting useful information about MACHOs from Earth-based parallax observations of microlensing events. We find that if one or more large (say $2.5\,\rm m$) telescopes are dedicated to observing a MACHO event for several nights near maximum amplification, then it is possible, in principle, to measure the velocity of the MACHO well enough to distinguish between disk and halo populations for events with $\omega {A_m}\!^2 \gta 1\,\rm day^{-1}$, where $\omega^{-1}$ denotes the timescale of the event and $A_m$ denotes its maximum amplification. Thus, if it turns out to be possible to reduce all other sources of error to below that of photon statistics, it may be feasible to do useful Earth-based parallax observations for high amplification events.
Holz Daniel E.
Wald Robert M.
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