Constraints on MACHOS with the EROS-2 Project

Details Constraints on MACHOS with the EROS-2 Project Constraints on MACHOS with the EROS-2 Project

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dmap.conf..142t&link_type=abstract

DARK MATTER IN ASTROPARTICLE AND PARTICLE PHYSICS. Proceedings of the 6th International Heidelberg Conference. Held 24-28 Septem

Physics

Dark Matter, Galactic Halo, Microlensing

Scientific paper

The EROS-2 collaboration has monitored during 6.7 years millions of stars in the Magellanic Clouds, in order to search for microlensing phenomena due to hypothetical compact dark objects in the Milky Way Halo ('machos'), constituting a component of Galactic dark matter. I will present the limit obtained by the EROS experiment on the macho content of the galactic halo, using only the brightest, well resolved stars (~ 7 million). The number of microlensing effects found is by far not numerous enough to account for the galactic dark matter. Our robust limit (f < 0.07 at 95% CL for 0.4 M&sun;) is now clearly in conflict with the MACHO experiment positive result (0.05 < f < 0.42 for 0.4 M&sun;). More generally, machos in the mass range 10-7M&sun; < M < 5M&sun; are ruled out as the primary occupants of the Milky Way Halo. Furthermore, a new constraint for higher machos masses (up to 150 solar masses) has been performed using the complete star sample. A preliminary limit is presented here.

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