Spitzer Observations of Magellanic Cloud Microlensing Events

Details Spitzer Observations of Magellanic Cloud Microlensing Events Spitzer Observations of Magellanic Cloud Microlensing Events

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20245g&link_type=abstract

Spitzer Proposal ID #20245

Computer Science

Scientific paper

The outstanding question in the interpretation of microlensing events observed toward the Magellanic Clouds (MC) is the location and nature of the lens population. Because Earth-based photometric observations are ambiguous in inferring the lens distance, existing MC survey events can be explained by lenses in the Galactic halo, the Galactic disk, the clouds themselves, or a combination of all three. Here we propose an exploratory program of target-of-opportunity Spitzer/IRAC photometric observations of LMC microlensing events detected in an ongoing ground-based survey. Because of Spitzer's Earth-trailing orbit, combining Spitzer and ground-based photometry determines the lens ``microlens parallax'', which unambiguously distinguishes among the three possible populations. A handful of such determinations will unambiguously settle the lens location controversy and associated uncertainty in interpreting MC microlensing surveys, and allow the determination of whether the putative halo lenses comprise a significant component of Galactic dark matter.

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