Strong gravitational lensing of quasars has the potential to unlock the poorly understood
physics of these fascinating objects, as well as serve as a probe of the lensing mass …

We present the results of 15 years of monitoring lensed quasars, which was conducted by
the COSMOGRAIL programme at the Leonhard Euler 1.2 m Swiss Telescope. The decade …

We report periodic oscillations in the 15-year-long optical light curve of the gravitationally
lensed quasar Q J0158− 4325 at zs= 1.29. The signal is enhanced during a high …

The gravitational lens system PS J0147+ 4630 (Andromeda's Parachute) consists of four
quasar images ABCD and a lensing galaxy. We obtained r-band light curves of ABCD in the …

Line profile distortions are commonly observed in gravitationally lensed quasar spectra.
These distortions are caused by microlensing from the stars in the lensing galaxy, which …

We present a microlensing analysis of updated light curves in three filters, the g-band, r-
band, and H-band, for the gravitationally lensed quasars Q0957+ 561 and SBS0909+ 532 …

Results of a four-month campaign of astronomical seeing measurements at Maidanak
astronomical observatory (MAO) are presented. A differential image motion monitor (DIMM) …

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The gravitational lens system PS J0147+ 4630 (Andromeda's Parachute) consists of four
quasar images ABCD and a lensing galaxy. We obtained $ r $-band light curves of ABCD in …

The accretion disc around the super massive black hole (SMBH) of quasars, and active
galactic nuclei (AGN) in general, is believed to be the central engine of the optical and UV …