A Rapid Microlensing Event in the Q0957+561A, B Gravitational Lens System
Wesley N. ColleyDepartment of Astronomy, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903Rudolph E. SchildHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138
2003en
ABI
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We re-analyze brightness data sampled intensively over 5 nights at two epochs separated by the quasar lens time delay, to examine the nature of the observed microlensing. We find strong evidence for a microlensing event with an amplitude of 1% and a time scale of twelve hours. The existence of such rapid microlensing, albeit at low amplitude, imposes constraints on the nature of the quasar and of the baryonic dark matter.
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