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Microlensing by Free-Floating Brown Dwarfs

Published online by Cambridge University Press:  26 May 2016

Hans Zinnecker
Hans Zinnecker*
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany

Abstract

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We propose a near-infrared microlensing survey of the central 2 degree field of the Galactic Center, in an attempt to estimate the surface density and mass distribution of distant free-floating brown dwarfs in the bulge and in the disk, acting as lenses of bright stars towards the Galactic Center. We estimate the probability (optical depth) of microlensing events to be 10-7 and the typical timescale (full-width) of the amplification lightcurve to be about 1 week. The necessary wide-field NIR survey technology should soon be available on UKIRT, CFHT, and with VISTA at ESO/Paranal.

Type
Part 9. Future Prospects
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 509 - 514
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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