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 …

Aims. We investigate the discrepancy between the predicted size of accretion disks (ADs) in
quasars and the observed sizes as deduced from gravitational microlensing studies …

Aims. We report the results from a photometric reverberation mapping campaign carried out
with the C18 telescope at the Wise Observatory from 2019 to 2020, targeting the active …

We study the weak deflection of light by nonrelativistic mass distributions described by two-
power-law densities ρ (R)= ρ 0 R-α (R+ 1) β-α, where α and β are non-negative integers …

Aims. We aim to reveal the sizes of the continuum and broad emission line (BEL) emitting
regions in the gravitationally lensed quasar SDSS J1004+ 4112 by analyzing the unique …

Aims. We present the results of an intensive six-month optical continuum reverberation
mapping campaign of the Seyfert 1 galaxy PG 2130+ 099 at redshift z= 0.063. The ground …

Aims. We aim to use signatures of microlensing induced by stars in the foreground lens
galaxy to infer the size of the accretion disk in the gravitationally lensed quasar Q 0957+ …

We present a simple but general argument that strongly limits the abundance of primordial
black holes (PBHs)(or other unknown population of compact objects) with masses similar to …

Aims. We have estimated black hole masses (M BH) for 14 gravitationally lensed quasars
using Balmer lines; we also provide estimates based on MgII and CIV emission lines for four …

The microlensing effect has developed into a powerful technique for a diverse range of
applications including exoplanet discoveries, structure of the Milky Way, constraints on …