Are the MACHO Microlenses in Front of the Megallanic Clouds or Inside Them?

Details Are the MACHO Microlenses in Front of the Megallanic Clouds or Inside Them? Are the MACHO Microlenses in Front of the Megallanic Clouds or Inside Them?

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20312004o&link_type=abstract

American Astronomical Society Meeting 203, #120.04; Bulletin of the American Astronomical Society, Vol. 35, p.1406

Astronomy and Astrophysics

Astronomy

Scientific paper

The MACHO collaboration has reported nearly two dozen microlensing events toward the LMC and SMC. The time scales for these events depend on the mass, distance, and velocity of the lensing objects. It has been suggested that the observed lensing time scales are consistent with a population of white dwarfs in the galactic halo. Using realistic assumptions about the mass and velocity distributions, we compare the observed distribution of time scales with those expected from such a hypothetical population of halo white dwarfs. We also examine the possibility that the lensing objects are low-mass stars within the Magellanic clouds themselves. We find that this self-lensing hypothesis actually provides a better fit to the data.

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