64 citations · 486 across the 44 of their papers we have counts for
10 papers · 1 filter
Structure function of the UV variability of Q0957+561
L. J. Goicoechea, V. N. Shalyapin, R. Gil-Merino +1
We present a detailed structure function analysis of the UV variability of Q0957+561. From new optical observations, we constructed normalized structure functions of the quasar lum…
New two-colour light curves of Q0957+561: time delays and the origin of intrinsic variations
V. N. Shalyapin, L. J. Goicoechea, E. Koptelova +2
We extend the gr-band time coverage of the gravitationally lensed double quasar Q0957+561. New gr light curves permit us to detect significant intrinsic fluctuations, to determine…
First robotic monitoring of a lensed quasar: intrinsic variability of SBS 0909+532
L. J. Goicoechea, V. N. Shalyapin, E. Koptelova +3
To go into the details about the variability of the double quasar SBS 0909+532, we designed a monitoring programme with the 2 m Liverpool Robotic Telescope in the r Sloan filter, s…
Amplification and variability of the AGN X-ray emission due to microlensing
L. C. Popovic, P. Jovanovic, T. Petrovic +1
We consider the contribution of microlensing to the AGN Fe K line and X-ray continuum amplification and variation. To investigate the variability of the line and X-ray continuum…
Gravitationally Lensed QSOs: Optical Monitoring with the EOCA and the Liverpool Telescope (LT)
L. J. Goicoechea, A. Ullan, J. E. Ovaldsen +3
The aim of this contribution is to present the two first phases of the optical monitoring programme of the Gravitational Lenses group at the Universidad de Cantabria (GLUC, http://…
Is there a caustic crossing in the lensed quasar Q2237+0305 observational data record?
R. Gil-Merino, J. Gonzalez-Cadelo, L. J. Goicoechea +2
We re-investigate the gravitationally lensed system Q2237+0305 data record to quantify the probability of having a caustic crossing in the A component. Several works assume that th…