Study of a Strategy for Parallax Microlensing Detection Towards the Magellanic Clouds

Abstract

In this article, we have investigated the possibility to distinguish between different galactic models through the microlensing parallax studies. We show that a systematic search for parallax effects can be done using the currently running alert systems and complementary photometric telescopes, to distinguish between different lens distance distributions. We have considered two galactic dark compact objects distributions, with total optical depths corresponding to the EROS current upper limits. These models correspond to two extreme hypothesis on a three component galactic structure made of a thin disc, a thick disc, and a spherically symmetric halo. Our study shows that for sub-solar mass lenses, an exposure of $8\times 10^7$ star$\times$yr toward LMC should allow to distinguish between these two extreme models. In addition the self-lensing hypothesis (lensing by LMC objects) can efficiently be tested through the method proposed here.

arXiv comment10 pages, 12 eps figures. To be published in A&A (accepted version). Minor changes: - Discussion added on the differential velocity of the thick galactic disk with respect to the thin disk. - Quality and lisibility of figures improved. - Typo errors corrected

References in corpus (6)

• The MACHO Project: Microlensing Results from 5.7 Years of LMC Observations
• First Observation of Parallax in a Gravitational Microlensing Event
• M Dwarfs From Hubble Space Telescope Star Counts III: The Groth Strip
• Optical Gravitational Lensing Experiment. OGLE 2000-BUL-43: A Spectacular Ongoing Parallax Microlensing Event. Difference Image Analysis
• Parallax-Shifted Microlensing Events from Ground-Based Observations of the Galactic Bulge
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• Constraining Galactic Models Through Parallax and Astrometry of Microlensing Events
• Polarimetric microlensing of circumstellar disks
• Parallax in microlensing toward the Magellanic Clouds: effect on detection efficiency and detectability
• Resolving Microlensing Events with Triggered VLBI
• Eclipsing negative-parity image of gravitational microlensing by a giant-lens star
• Frequency Shift in Binary Lensing System