Detection of brown dwarfs by the micro-lensing of unresolved stars
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The presence of brown dwarfs in the dark galactic halo could be detected through their gravitational lensing effect and experiments under way monitor about one million stars to observe a few lensing events per year. We show that if the photon flux from a galaxy is measured with a good precision, it is not necessary to resolve the stars and besides more events could be observed.
14 p., LaTeX, 4 figures available on request, PAR-LPTHE 92 39/LPC 92 17
14 p., LaTeX, 4 figures available on request, PAR-LPTHE 92 39/LPC 92 17