218 articles – 619 Notices  [english version]
HAL : in2p3-00013803, version 1

Fiche concise  Récupérer au format
Microlensing towards M31 with MDM data
Calchi Novati S., Jetzer P., Scarpetta G., Giraud-Heraud Y., Kaplan J. et al
Astronomy and Astrophysics 405 (2003) 851-857 - http://hal.in2p3.fr/in2p3-00013803
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Planète et Univers/Astrophysique
Microlensing towards M31 with MDM data
S. Calchi Novati, P. Jetzer, G. Scarpetta, Y. Giraud-Heraud1, J. Kaplan1, S. Paulin-Henriksson1, A. Gould
1 :  PCC - Physique Corpusculaire et Cosmologie - Collège de France
CNRS : UMR7553 – IN2P3 – Université Paris VII - Paris Diderot
11, place Marcelin Berthelot - 75231 Paris Cedex 05
We report the final analysis of a search for microlensing events in the direction of the Andromeda galaxy, which aimed to probe the MACHO composition of the M31 halo using data collected during the 1998-99 observational campaign at the MDM observatory. In a previous paper, we discussed the results from a first set of observations. Here, we deal with the complete data set, and we take advantage of some INT observations in the 1999-2000 seasons. This merging of data sets taken by different instruments turns out to be very useful, the study of the longer baseline available allowing us to test the uniqueness characteristic of microlensing events. As a result, all the candidate microlensing events previously reported turn out to be variable stars. We further discuss a selection based on different criteria, aimed at the detection of short--duration events. We find three candidates whose positions are consistent with self--lensing events, although the available data do not allow us to conclude unambiguously that they are due to microlensing.

Articles dans des revues avec comité de lecture
Astronomy and Astrophysics (Astron. Astrophys.)
Publisher EDP Sciences
ISSN 0004-6361 (eISSN : 1432-0756)
The European Southern Observatory (ESO) 2003 - the original publication is avalaible at http://www.aanda.org

PCC 03 06
Lien vers le texte intégral :