1992/11/04 by Paul Baillon, Alain Bouquet, Yannick Giraud-Héraud +1
Physics and Astronomy · #astro-ph
published as Astron.Astrophys. 277 (1993) 1-9 · 14 p., LaTeX, 4 figures available on request, PAR-LPTHE 92 39/LPC 92 17
arxiv created 1992/11/04 · arxiv updated 2009/12/01
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.