{ "id": "astro-ph/9311045", "version": "v2", "published": "1993-11-18T13:00:42.000Z", "updated": "1993-11-19T10:04:41.000Z", "title": "Gravitational microlensing by the dark halo of M31", "authors": [ "Philippe Jetzer" ], "comment": "4, latex, ZU-TH 27/93", "categories": [ "astro-ph" ], "abstract": "It has been shown by Paczy\\'nski that gravitational microlensing is potentially a useful method for detecting the dark constituents of the halo of our galaxy, if their mass lies in the approximate domain $10^{-6}