Observational Limits on Machos in the Galactic Halo
Astrophysics
2008-02-03 v2
Abstract
We present final results from the first phase of the EROS search for gravitational microlensing of stars in the Magellanic Clouds by unseen deflectors (machos: MAssive Compact Halo Objects). The search is sensitive to events with time scales between 15 minutes and 200 days corresponding to deflector masses in the range 1.e-7 to a few solar masses. Two events were observed that are compatible with microlensing by objects of mass of about 0.1 Mo. By comparing the results with the expected number of events for various models of the Galaxy, we conclude that machos in the mass range [1.e-7, 0.02] Mo make up less than 20% (95% C.L.) of the Halo dark matter.
Keywords
Cite
@article{arxiv.astro-ph/9612102,
title = {Observational Limits on Machos in the Galactic Halo},
author = {EROS collaboration and C. Renault and C. Afonso and E. Aubourg and P. Bareyre and F. Bauer and S. Brehin and C. Coutures and C. Gaucherel and J. F. Glicenstein and B. Goldman and M. Gros and D. Hardin and J. de Kat and M. Lachieze-Rey and B. Laurent and E. Lesquoy and C. Magneville and A. Milsztajn and L. Moscoso and N. Palanque-Delabrouille and F. Queinnec and J. Rich and M. Spiro and L. Vigroux and S. Zylberajch and R. Ansari and F. Cavalier and F. Couchot and B. Mansoux and M. Moniez and O. Perdereau and J. -Ph. Beaulieu and R. Ferlet and Ph. Grison and A. Vidal-Madjar and J. Guibert and O. Moreau and E. Maurice and L. Prevot and C. Gry and S. Char and J. Fernandez},
journal= {arXiv preprint arXiv:astro-ph/9612102},
year = {2008}
}
Comments
4 pages, 3 Postscript figures, to be published in Astronomy & Astrophysics