12 citations · 20 across the 4 of their papers we have counts for
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astro-ph2008★ 8 cited
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…
astro-ph2006
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…
astro-ph2004
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…