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Astron. Astrophys. 350, L57-L61 (1999)

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Letter to the Editor

Kinematics of LMC stellar populations and self-lensing optical depth

P. Salati 1,2, R. Taillet 1,2, É. Aubourg 3, N. Palanque-Delabrouille 3 and M. Spiro 3

1 LAPTH, chemin de Bellevue, B.P. 110, 74941 Annecy-le-Vieux Cedex, France
2 Université de Savoie, B.P. 1104, 73011 Chambéry Cedex, France
3 CEA, DSM, DAPNIA, Centre d'Études de Saclay, 91191 Gif-sur-Yvette Cedex, France

Received 29 April 1999 / Accepted 25 September 1999

Abstract

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-1. The present work focuses on showing that such dispersions comply with current [FORMULA] km s-1 limits set by observation on specific LMC populations. We also show that this model reproduces both the [FORMULA] observed optical depth and the event duration distribution.

Key words: Galaxy: halo – Galaxy: kinematics and dynamics – cosmology: dark matter – cosmology: gravitational lensing – Galaxy: stellar content

Send offprint requests to: Eric.Aubourg@cea.fr

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© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999
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