Search for microlensing

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Goal 5: To search for Microlensing events

reddened events, short timescale events, and high magnification events in obscured high density fields. The spatial dependence of the microlensing optical depth τ has been modelled [1], and can probe directly the mass distribution contained in the inner regions. Unfortunately, current microlensing searches do not cover the whole bulge or the plane, and miss the inner regions where this optical depth is higher, poorly constraining the models [2]. A map of microlensing optical depth τ for the whole bulge can be made, allowing also to search for asymmetries in τ . In addition, we expect to detect microlensing of source stars in the Sgr dwarf galaxy [3].

References

  1. Bissantz et al. 1997, MNRAS, 289, 651
  2. Bissantz & Gerhard 2002, MNRAS, 330, 591; Bissantz et al. 2004, ApJ, 301, L155
  3. e.g. Popowski et al. 2005, ApJ, 631, 879
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