Microlensing variability in time-delay quasars
D. ParaficzDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark e-mail: [email protected]J. HjorthDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark e-mail: [email protected]I. BurudNorwegian Meteorological Institute, PO Box 43, Blindern, 031 3 Oslo, NorwayP. JakobssonDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark e-mail: [email protected]Á. ElíasdóttirDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark e-mail: [email protected]
2006en
ABI
Аннотация
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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