359 citations · 1.2k across the 38 of their papers we have counts for
4 papers · 1 filter
Q2237+0305 in X-rays: spectra and variability with XMM-Newton
E. V. Fedorova, V. I. Zhdanov, C. Vignali +1
X-ray observations of gravitationally lensed quasars may allow us to probe the inner structure of the central engine of a quasar. Observations of Q2237+0305 (Einstein Cross) in X-r…
Cosmological scalar fields that mimic the cosmological model
V. I. Zhdanov, G. Ivashchenko
We look for cosmologies with a scalar field (dark energy without cosmological constant), which mimic the standard cosmological model yielding exactly the same large-scale ge…
Angular Correlation Function of Quasars from SDSS DR3
G. Yu. Ivashchenko, V. I. Zhdanov
We estimate the two-point angular correlation function (CF) of quasars from SDSS DR3 using a special method of comparison random catalog generation. The best-fit value for the CF p…
Anomalous Fluctuations in Observations of Q0957+561 A,B: Smoking Gun of a Cosmic String?
R. Schild, I Masnyak, B. Hnatyk +1
We report the detection of anomalous brightness fluctuations in the multiple image Q0957+561 A,B gravitational lens system, and consider whether such anomalies have a plausible int…