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Recherche de matière noire galactique par détection de microlentilles gravitationnelles en photométrie différentielle

Abstract : Many experimental results lead to the conclusion that a large amount of galactic matter is dark. If this matter is in the form of compact objects, they could be detected by gravitational microlensing. Eros has already excluded that compact objects between 10^(-7) and 10 solar mass are important constituents of the halo. The present work deals with the analysis of Eros data towards the SMC. I use difference image analysis to improve the sensitivity. After recalling the motivation of this search, I describe the analysis method and the whole reduction processus. The small number of detected microlensing candidates confirms the preceding results towards the Magellanic Clouds. Dark matter under the form of cold clouds of gaz has also been searched with the same data set. If they contain dust, such clouds would be opaque and may be detected by the occultation of background stars. The very small number of detected occultations leads to the conclusion that such clouds cannot represent a significant part of the halo.
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https://tel.archives-ouvertes.fr/tel-00003907
Contributor : Laurent Le Guillou <>
Submitted on : Friday, December 5, 2003 - 7:18:15 AM
Last modification on : Friday, May 29, 2020 - 4:02:18 PM
Long-term archiving on: : Friday, April 2, 2010 - 6:54:21 PM

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  • HAL Id : tel-00003907, version 1

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Laurent Le Guillou. Recherche de matière noire galactique par détection de microlentilles gravitationnelles en photométrie différentielle. Astrophysique [astro-ph]. Université Pierre et Marie Curie - Paris VI, 2003. Français. ⟨tel-00003907⟩

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