Microlensing variability in time-delay quasars

Details Microlensing variability in time-delay quasars Microlensing variability in time-delay quasars

2006-07-07

arxiv.org/abs/astro-ph/0607133v1

Astron.Astrophys. 455 (2006) L1-L4

Astronomy and Astrophysics

Astrophysics

12 pages, 5 figures, uses natbib.sty and aa.cls

Scientific paper

10.1051/0004-6361:20065502

We have searched for microlensing variability in the light curves of five gravitationally lensed quasars with well-determined time delays: SBS 1520+530, FBQ 0951+2635, RX J0911+0551, B1600+434 and HE 2149-2745. By comparing the light curve of the leading image with a suitably time offset light curve of a trailing image we find that two (SBS 1520+530 and FBQ 0951+2635) out of the five quasars have significant long-term (years) and short-term (100 days) brightness variations that may be attributed to microlensing.The short-term variations may be due to nanolenses, relativistic hot or cold spots in the quasar accretion disks, or coherent microlensing at large optical depth.

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