Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-24
Mon.Not.Roy.Astron.Soc. 339 (2003) 701
Astronomy and Astrophysics
Astrophysics
MNRAS accepted, to be published 2003. 6pp w/ 10 eps fig, references updated to match proof
Scientific paper
10.1046/j.1365-8711.2003.06208.x
Although a decade of microlensing searches towards the Large Magellanic Cloud (LMC) has detected 13-25 possible microlensing events, the nature and the location of the lenses, being either halo machos or LMC stars, remains a subject of debate. The star-star lensing models generically predict the existence of a small population (more than about 5 percent of stars with a spatial and kinematic distribution different from the thin, young disc of the LMC. Here we present the results of a large spectroscopic survey of the LMC, consisting of more than 1300 radial velocities measured accurately with the 2dF instrument. In this large sample, no evidence is found for any extraneous population over the expected LMC and Galactic components. Any additional, kinematically distint, population can only be present at less than the 1 percent level. We discuss the significance of this finding for the LMC self-lensing models.
Ibata Rodrigo
Irwin Mike
Lewis Geraint
Zhao HongSheng
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