The EROS microlensing survey has monitored nearly 100 million stars for seven years , to search for halo brown dwarfs and compact objects in the Galactic disk .
In this paper , we review the various EROS observation programs and the corresponding microlensing search results .
In particular , based on LMC and SMC observations , EROS excludes a major contribution from compact objects with masses in the range 2. \times 10 ^ { -7 } -1 M _ { \odot } to the Galactic halo .
Less than 25 % of the standard halo mass can be made of such objects , while the EROS measured optical depths toward the Galactic spiral arms ( < \tau _ { SA } > \simeq 0.43 \times 10 ^ { -6 } ) and Galactic bulge ( < \tau _ { GC } > \simeq 0.93 \times 10 ^ { -6 } ) are compatible with Galactic model predictions if the contribution from an elongated bar in the centre is taken into account .