EROS/MACHO Gravitational Microlensing Events Toward LMC in Evans Halo Model

Details EROS/MACHO Gravitational Microlensing Events Toward LMC in Evans Halo Model EROS/MACHO Gravitational Microlensing Events Toward LMC in Evans Halo Model

2002-03-04

arxiv.org/abs/astro-ph/0203037v3

Int.J.Mod.Phys. D12 (2003) 45

Astronomy and Astrophysics

Astrophysics

17 pages, 8 figures, accepted for publication in Int. J. Mod. Phys D

Scientific paper

10.1142/S0218271803002676

After a decade of gravitational microlensing experiments, 13 to 17 events by MACHO (depending on quality) and two events by EROS have been detected. All of those have been observed in the direction of Large Magellanic Cloud. We use Evans spherically symmetric halo model to study the rate of microlensing events. The expected number of events in this model obtain by using EROS and MACHO observational efficiencies. We compare our numbers with the observed events to obtain the fraction of halo that is made by compact objects. It is shown that results derived from two experiments are in good agreement with each other and MACHOs, comprise only a fraction (depending on the model) of Milky Way halo. The results are also compatible with the White Dwarfs population studies in the Hubble Deep Field.

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