Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-22
Astrophys.J. 645 (2006) 835-840
Astronomy and Astrophysics
Astrophysics
6 pages, to appear in ApJ. As ever, quality of figures reduced
Scientific paper
10.1086/504579
The magnification induced by gravitational microlensing is sensitive to the size of a source relative to the Einstein radius, the natural microlensing scale length. This paper investigates the effect of source size in the case where the microlensing masses are distributed with a bimodal mass function, with solar mass stars representing the normal stellar masses, and smaller masses (down to $8.5\times 10^{-5}$M$_\odot$) representing a dark matter component. It is found that there exists a critical regime where the dark matter is initially seen as individual compact masses, but with an increasing source size the compact dark matter acts as a smooth mass component. This study reveals that interpretation of microlensing light curves, especially claims of small mass dark matter lenses embedded in an overall stellar population, must consider the important influence of the size of the source.
Gil-Merino Rodrigo
Lewis Geraint F.
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