Microlensing modulation by quadrupole variation

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dc.creatorDubath, Florian
dc.creatorGasparini, Maria Alice
dc.creatorDurrer, Ruth
dc.date2006-03-20
dc.date2007-01-11
dc.date.accessioned2026-07-07T10:28:00Z
dc.date.available2026-07-07T10:28:00Z
dc.descriptionWe investigate microlensing in the case where the lens is considered as an extended object. We use a multipolar expansion of the lens potential and show that the time-varying nature of the quadrupole contribution allows to separate it from the mass and spin contributions and leads to specific modulations of the amplification signal. As example we study the case of binary system lenses in our galaxy. The modulation is observable if the rotation period of the system is smaller than the time over which the amplification is significant and if the impact parameter of the passing light ray is sufficiently close to the Einstein radius so that the amplification is large. Observations of this modulation can reveal important information on the quadrupole and thus on the gravitational radiation emitted by the binary lens. Even if not observed directly, because of their importance the quadrupole modulation has to be included in the error budget for high magnification ($μ\leq7$) microlensing events.
dc.descriptionMatches publicated version
dc.identifierhttps://arxiv.org/abs/astro-ph/0603536
dc.identifierhttp://arxiv.org/abs/astro-ph/0603536
dc.identifierPhys.Rev.D75:024015,2007
dc.identifierdoi:10.1103/PhysRevD.75.024015
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177303
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleMicrolensing modulation by quadrupole variation
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