Microlensing variability in FBQ 0951+2635: Short-time-scale events or a long-time-scale fluctuation?

V. N. Shalyapin, L. J. Goicoechea, E. Koptelova, B. P. Artamonov, A. V. Sergeyev, A. P. Zheleznyak, T. A. Akhunov, O. A. Burkhonov, S. N. Nuritdinov, A. Ullán

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We present and analyse new R-band frames of the gravitationally lensed double quasar FBQ 0951+2635. These images were obtained with the 1.5-m AZT-22 Telescope at Maidanak (Uzbekistan) during the 2001-2006 period. Previous results in the R band (1999-2001 period) and the new data allow us to discuss the dominant kind of microlensing variability in FBQ 0951+2635. The time evolution of the flux ratio A/. B does not favour the continuous production of short-time-scale (∼months) flares in the faintest quasar component B (crossing the central region of the lensing galaxy). Instead of a rapid variability scenario, the observations are consistent with the existence of a long-time-scale fluctuation. The flux ratio shows a bump during the 2003-2004 period and a quasi-flat trend in more recent epochs. Apart from the global behaviour of A/. B, we study the intra-year variability over the first semester of 2004, which is reasonably well sampled. Short-time-scale microlensing is not detected in that period. Additional data in the i band (from new i-band images taken in 2007 with the 2-m Liverpool Robotic Telescope at La Palma, Canary Islands) also indicate the absence of short-time-scale events in 2007.

Original languageEnglish
Pages (from-to)1982-1989
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Aug 2009


  • Galaxies: general
  • Gravitational lensing
  • Quasars: general
  • Quasars: individual: FBQ 0951+2635


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