Constraints on the slope of the dark halo mass function by microlensing observables

Details Constraints on the slope of the dark halo mass function by microlensing observables Constraints on the slope of the dark halo mass function by microlensing observables

1999-07-13

arxiv.org/abs/astro-ph/9907160v2

Astronomy and Astrophysics

Astrophysics

10 LaTex pages, 2 postscript figures, accepted on 21/5/2001 for pubblication on A&A; title changed, completely revised version

Scientific paper

We investigate the dark halo lens mass function (MF) for a wide class of spheroidal non singular isothermal models comparing observed and observable microlensing quantities for MACHO observations towards LMC and taking into account the detection efficiency. We evaluate the microlensing observable quantities, i.e. observable optical depth, number of events and mean duration, for models with homogenous power - law MF changing the upper and lower mass limits and the flattening of the dark halo. By applying the simple technique of the inverse problem method we are then able to get some interesting constraints on the slope $\alpha$ of the MF and on the dark halo mass fraction f made out by MACHOs consistently with previous results.

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