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We investigate gravitational microlensing of point-like lenses surrounded bydiffuse gas clouds. Besides gravitational bending, one must also considerrefraction and absorption phenomena. According to the cloud density, the lightcurves may suffer small to large deviations from Paczynski curves, up tocomplete eclipses. Moreover, the presence of the cloud endows this type ofmicrolensing events with a high chromaticity and absorption lines recognizableby spectral analysis. It is possible that these objects populate the halo ofour galaxy, giving a conspicuous contribution to the fraction of the baryonicdark matter. The required features for the extension and the mass of the cloudto provide appreciable signatures are also met by several astrophysicalobjects.Comment: 11 pages with 4 figures. Accepted by A&

Microlensing by compact objects associated with gas clouds