Gravitational Microlensing: the search of MACHOs in the Galactic halo (Review)

Details Gravitational Microlensing: the search of MACHOs in the Galactic halo (Review) Gravitational Microlensing: the search of MACHOs in the Galactic halo (Review)

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007waas.work...85m&link_type=abstract

"1st Workshop of Astronomy and Astrophysics for Students" held in Naples (ITALY) on April 19-20, 2006. Published by INFN-Naples,

Astronomy and Astrophysics

Astrophysics

Scientific paper

Gravitational Microlensing represents an effective tool in searching for non-luminous astrophysical compact objects moving in the halo of the Milky Way, the so-called MACHOs. We show here the most recent experimental results for microlensing of stars in the Large Magellanic Cloud and in M31, discussing their physical interpretation. Both the directions of investigation give the indication that the Galactic halo is composed in part (˜20%) by MACHOs (MAssive Compact Halo Objects), although other explanations are possible. Among them, the self-lensing hypothesis turns out to be inadequate to describe all microlensing results. Instead, a recent analysis suggests that up to about half of the observed events towards the Large Magellanic Cloud could be due to a gravitational lens population located in its halo.

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