Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20121p&link_type=abstract
Spitzer Proposal ID #20121
Physics
Scientific paper
We propose to use Spitzer/IRAC to obtain mid-IR photometry for 7 bona-fide LMC microlensing events seen in the original MACHO survey. The purpose of this survey is to assess the fraction of lensing objects which belong to some population of dwarf stars in the disk of our own Galaxy. Cool lens stars are revealed in the IRAC bandpasses via an infrared flux excess, a technique we have already used to show that the lens of event MACHO-LMC-5 is an ~M5 dwarf in a related GTO program. These data, in combination with existing Spitzer/IRAC GTO data and HST ACS data (proposed in HST Cycle 14), will be used to ascertain the basic properties of the lenses for all 15 true microlensing events from the original MACHO survey. These data will allow us to draw important conclusions as to what fraction of these events have lenses which belong to some population of dwarf stars in the disk and what fraction must be due to lenses in the halo or in the LMC itself. These data will greatly increase our understanding of the structure of the Galaxy by characterizing the stellar population responsible for the gravitational microlensing.
Alcock Charles
Fazio Giovanni
Kallivayalil Nitya
Patten Brian
Werner Michael
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