Kinematics of LMC stellar populations and self-lensing optical depth

Details Kinematics of LMC stellar populations and self-lensing optical depth Kinematics of LMC stellar populations and self-lensing optical depth

1999-04-28

arxiv.org/abs/astro-ph/9904400v2

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures. Major revision of the article to include a better comparison to existing data and therefore the study of a

Scientific paper

Recent observations give some clues that the lenses discovered by the microlensing experiments in the direction of the Magellanic Clouds may be located in these satellite galaxies. We re-examine the possibility that self-lensing alone may account for the optical depth measured towards the Large Magellanic Cloud (LMC). We present a self-consistent multi-component model of the LMC consisting of distinct stellar populations, each associated to a vertical velocity dispersion ranging from 10 to 60 km/s. The present work focuses on showing that such dispersions comply with current 20 - 30 km/s limits set by observation on specific LMC populations. We also show that this model reproduces both the 1-2 10^-7 observed optical depth and the event duration distribution.

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