Microlensing of Relativistic Knots in the Quasar HE1104-1805

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.

The paper is available as astro-ph/0206263 from arXiv astro/ph preprint archive or: Schechter et al., 2003, ApJ, 584, 657.

Full dataset of observations of HE1104-1805 collected during the OGLE-II and III survey, as well as the time delay determination are described in the paper by Wyrzykowski et al., 2003, Acta Astron., 53, 229 (astro-ph/0310752).

Photometric data of HE1104-1805 are available via THIS LINK.

Please cite the following paper(s) when using the data or referring to these OGLE results:
- Schechter et al., 2003, ApJ, 584 657
- Wyrzykowski et al., 2003, Acta Astron., 53, 229.