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The Effect of a Time-Varying Accretion Disk Size on Quasar Microlensing Light Curves | | Jeffrey A. Blackburne
; Christopher S. Kochanek
; | | Date: |
16 Feb 2010 | | Abstract: | Microlensing perturbations to the magnification of gravitationally lensed
quasar images are dependent on the angular size of the quasar. If quasar
variability at visible wavelengths is caused by a change in the area of the
accretion disk, it will affect the microlensing magnification. We derive the
expected signal, assuming that the luminosity scales with some power of the
disk area, and estimate its amplitude using simulations. We discuss the
prospects for detecting the effect in real-world data and for using it to
estimate the logarithmic slope of the luminosity’s dependence on disk area.
Such an estimate would provide a direct test of the standard thin accretion
disk model. We tried fitting 6 seasons of the light curves of the lensed quasar
HE 0435-1223 including this effect as a modification to the Kochanek et al.
(2006) approach to estimating time delays. We find a dramatic improvement in
the goodness of fit and relatively plausible parameters, but a robust estimate
will require a full numerical calculation in order to correctly model the
strong correlations between the structure of the microlensing magnification
patterns and the magnitude of the effect. We also comment briefly on the effect
of this phenomenon on the stability of time delay estimates. | | Source: | arXiv, 1002.3126 | | Services: | Forum | Review | PDF | Favorites | |
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