Limits on the MACHOS from EROS-2

Details Limits on the MACHOS from EROS-2 Limits on the MACHOS from EROS-2

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007idm..conf..217r&link_type=abstract

THE IDENTIFICATION OF DARK MATTER. Proceedings of the Sixth International Workshop. Held 11-16 September 2006 in Rhodes, Greece.

Physics

Galaxy: Halo, Cosmology: Dark Matter, Gravitational Lensing

Scientific paper

We present the results of the EROS-2 search for microlensing of stars in the Magellanic Clouds. Such events could be caused by macho dark matter in the Milky Way halo. Unlike all previous studies of Magellanic microlensing, we use only a subsample of 7 × 106 bright stars. This strategy minimizes backgrounds due to variable stars and ensures accurate determination of lensing parameters by minimizing source confusion (blending). Using this sample of bright stars, only one candidate event was found, whereas ~ 42 events would have been expected if the Halo were entirely populated by objects of mass M ~ 0.4M&sun;. Combined with the results of EROS-1, this implies that the optical depth toward the Large Magellanic Cloud (LMC) due to such lenses is τ < 0.36 × 10-7 (95%CL), corresponding to a fraction of the halo mass of less than 7%. This limit on the optical depth is at variance with the measurement of the MACHO collaboration near the center of the LMC, implying that a significant fraction of their events are due to lenses in the LMC itself.

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