The statistics of microlensing light curves. II. Temporal analysis.

Details The statistics of microlensing light curves. II. Temporal analysis. The statistics of microlensing light curves. II. Temporal analysis.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.283..225l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 283, No. 1, p. 225 - 240

Statistics

43

Methods: Numerical -- Gravitational Lensing, Gravitational Microlensing: Statistics, Gravitational Microlensing: Light Curves, Gravitational Microlensing: Quasars

Scientific paper

Microlensing at cosmological distances can induce violent fluctuations in the observed light curves of macrolensed quasars. In a previous publication the amplification probability distributions for a large sample of microlensing light curves were presented. This paper extends these earlier results and presents a temporal analysis for this light-curve sample. The temporal properties are explored using the first-order structure function. The results of this study show that (1) the asymptotic global curvature of the structure function depends on the macrolensing parameters σ* and γ and not on the detail of the mass distribution, (2) the characteristic timescale for variability due to microlensing is ∝√, where is the average mass of the microlensing objects, and again does not depend on the detailed shape of the mass distribution, and (3) the structure function time-scale does not vary with shear angle as a purely geometric transformation, but does possess an underlying symmetry solely dependent on the macrolensing parameters. A comparison of simulations of the quadruple lens, 2237+0305, with the currently available temporal light curves suggests that the average mass distribution of the lensing objects in 2237+0305 is within the range 0.1 < < 10 Msun.

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