SEARCH FOR VERY LOW MASS OBJECTS IN THE GALACTIC HALO

• Published in: arXiv.org
• Main Authors: collaboration, EROS, Aubourg, E, Bareyre, P, Brehin, S, Gros, M, Lachieze-Rey, M, Laurent, B, Lesquoy, E, Magneville, C, Milsztajn, A, Moscoso, L, Queinnec, F, Rich, J, Spiro, M, Vigroux, L, Zylberajch, S, Ansari, R, Cavalier, F, Moniez, M, Beaulieu, J P, Ferlet, R, Grison, Ph, Vidal-Madjar, A, Maurice, E, Prevot, L, Gry, C, Guibert, J, Moreau, O, Tajahmady, F
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 05.03.1995
• Subjects: Cosmology; Dark matter; Galactic halos; Galaxies; Gravitation; Gravitational lenses; Kinematics; Light curve; Magellanic clouds; Microlenses; Searching
• ISSN: 2331-8422

We present results from a search for gravitational microlensing of stars in the Large Magellanic Cloud by low mass objects in the Galactic Halo. The search uses the CCD light curves of about 82,000 stars with up to 46 measurements per night over a period of 10 months. No light curve exhibits a form that is consistent with a microlensing event of maximum amplification greater than 1.2. This null result makes it unlikely that the Halo is dominated by objects in the mass range \(5 10^{-8}M_{\odot} < M <5 10^{-4}M_{\odot} \). keywords{Galaxy : Halo, kinematics and dynamics, stellar content -- Cosmology : dark matter, gravitational lensing}