Source blending effects on microlensing time-histograms and optical depth determinatione

Details Source blending effects on microlensing time-histograms and optical depth determinatione Source blending effects on microlensing time-histograms and optical depth determinatione

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sf2a.conf...47a&link_type=abstract

Abstracts from SF2A-2001: Semaine de l'Astrophysique Francaise, meeting held in Lyon, France, May 28-June 1st, 2001, Eds.: F. Co

Astronomy and Astrophysics

Astrophysics

Scientific paper

Source blending in microlensing experiments is known to modify the Einstein time of the observed events.In this paper, we conduct Monte-Carlo calculations, using the analytical relationships derived by Han (1999) to quantify the effect of blending on the observed event time distribution and optical depth. we show that short-time events are affected, significantly by source blending and that, for moderately blended sources, the optical depth is globaly overestimated, because of an underestimation of the exposure. The corrected, lower optical depth toward the Galactic Bulge is in better agreement with the value inferred from galactic models, reconciling theoretical and observational determinations.

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