LMC self-lensing from a new perspective

November 2004 • 2004A&A...427...61M

Authors • Mancini, L. • Calchi Novati, S. • Jetzer, Ph. • Scarpetta, G.

Abstract • We present a new analysis of the location of the observed microlensing events in the direction of the Large Magellanic Cloud (LMC). This is carried out starting from a recently drawn coherent picture of the geometrical structure and dynamics of the LMC disk and by considering different configurations for the LMC bar. In this framework it clearly emerges that the spatial distribution of the events observed so far shows a near-far asymmetry. This turns out to be compatible with the optical depth calculated for the LMC halo objects. Our main conclusion, supported by a statistical analysis of the outcome of an evaluation of the microlensing rate, is that self-lensing cannot account for all the observed events. Finally we propose a general inequality to calculate quickly an upper limit to the optical depth along a line of view through the LMC center.

Links

• PREPRINT http://arxiv.org/abs/astro-ph/0405257
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/2004A%26A...427...61M
• POSTSCRIPT https://www.aanda.org/10.1051/0004-6361:20034535/postscript
• ELECTR http://www.aanda.org/htbin/resolve?bibcode=2004A%26A...427...61MFUL
• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2004A%26A...427...61M
• PDF https://www.aanda.org/10.1051/0004-6361:20034535/pdf
• SPIRES http://inspirehep.net/search?p=find+eprint+astro-ph/0405257