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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-17349

Ingrosso, G; Novati Calchi, S; de Paolis, F; Jetzer, P; Nucita, A A; Scarpetta, G; Strafella, F (2008). A new analysis of the MEGA M 31 microlensing events. Astronomy and Astrophysics, 462(3):895-902.



We discuss the results of the MEGA microlensing campaign towards M 31. Our analysis is based on analytically evaluating the microlensing rate, taking the observational efficiency into account as given by the MEGA collaboration. In particular, we studied the spatial and time-duration distributions of the microlensing events for several mass distribution models of the M 31 bulge. We find that only for extreme models of the M 31 luminous components is it possible to reconcile the total observed MEGA events with the expected self-lensing contribution. Nevertheless, the expected spatial distribution of self-lensing events is more concentrated and hardly agrees with the observed distribution. We thus find it difficult to explain all events as due to self-lensing alone. On the other hand, the small number of events does not yet allow firm conclusions to be drawn on the halo dark matter fraction in the form of MACHOs.

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
DDC:530 Physics
Deposited On:06 Mar 2009 15:25
Last Modified:27 Nov 2013 23:41
Publisher:EDP Sciences
Publisher DOI:10.1051/0004-6361:20065851
Citations:Web of Science®. Times Cited: 18
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Scopus®. Citation Count: 19

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