Microlensing of Relativistic Knots in the Quasar HE1104-1805

Details Microlensing of Relativistic Knots in the Quasar HE1104-1805 Microlensing of Relativistic Knots in the Quasar HE1104-1805

2002-06-16

arxiv.org/abs/astro-ph/0206263v2

Astrophys.J. 584 (2003) 657-663

Astronomy and Astrophysics

Astrophysics

As accepted for publication in ApJ. 22 pages. The discussion of microlensing at high optical depth has been shortened and a fe

Scientific paper

10.1086/345716

We present 3 years of photometry of the ``Double Hamburger'' lensed quasar, HE1104-1805, obtained on 102 separate nights using the OGLE 1.3-m telescope. Both the A and B images show variations, but with substantial differences in the lighcurves at all time delays. At the 310 day delay reported by Wisotzki and collaborators the difference lightcurve has an rms amplitude of 0.060 mag. The structure functions for the A and B images are quite different, with image A more than twice as variable as image B (a factor of 4 in structure function) on timescales of less than a month. Adopting microlensing as a working hypothesis for the uncorrelated variability, the short timescale argues for the relativistic motion of one or more components of the source. We argue that the small amplitude of the fluctuations is due to the finite size of the source with respect to the microlenses.

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