SIMBAD references

2005ApJ...630..887G - Astrophys. J., 630, 887-891 (2005/September-2)

Probing MACHOs toward the Galactic Bulge.


Abstract (from CDS):

If the massive compact halo object (MACHO) fraction of the Galactic dark halo is f∼20%, as suggested by some microlensing experiments, then about 1.2% of lensing events toward the Galactic bulge are due to MACHOs. For the 40% of these that lie nearby (Dl<4 kpc), measurement of their distance Dlwould distinguish them from bulge lenses, while measurement of their transverse velocity vlwould distinguish them from disk lenses. Hence, it would be possible to identify about 0.5%(f/20%) of all events as due to MACHOs. I show that a planned experiment using the Space Interferometry Mission (SIM PlanetQuest) could thereby detect 1 or 2 such events. This is at the margin of what is required because of a small but nonnegligible background from spheroid stars.

Abstract Copyright:

Journal keyword(s): Cosmology: Dark Matter - Galaxies: Stellar Content - Cosmology: Gravitational Lensing - Instrumentation: Interferometers

Simbad objects: 5

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