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The Contribution Of Binaries To The Observed Galactic Microlensing Events

Published online by Cambridge University Press:  25 May 2016

M. Dominik  and
A. C. Hirshfeld
M. Dominik
Affiliation:
Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany
A. C. Hirshfeld
Affiliation:
Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany

Abstract

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Most of the detected galactic microlensing events are commonly explained as due to microlensing of a pointlike source by a pointlike lens. We have found statistical methods to determine the goodness-of-fit for a specific model of source and lens beyond the assumption that the errors are normal, which does not always hold. In particular, we argue that at least one weak binary lensing event has already been detected (MACHO LMC#1) and thereby confirm our former hypothesis (Dominik & Hirshfeld 1994). We also find that this fit is not unique. We emphasize that knowledge of the fraction of binaries among the observed microlensing events is crucial for estimating the mass distribution of the observed dark objects.

Type
Chapter 7: Microlensing In the Galaxy
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 229 - 230
Copyright
Copyright © Kluwer 1996 

References

Dominik, M., & Hirshfeld, A. C. 1994, A&A, 289, L31 Google Scholar
Mao, S., & Di Stefano, R. 1995, ApJ, 440, 22 CrossRefGoogle Scholar