89 citations · 255 across the 10 of their papers we have counts for
10 papers
Microlensing variability in FBQ 0951+2635: short-timescale events or a long-timescale fluctuation?
V. N. Shalyapin, L. J. Goicoechea, E. Koptelova +7
We present and analyse new R-band frames of the gravitationally lensed double quasar FBQ 0951+2635. These images were obtained with the 1.5m AZT-22 Telescope at Maidanak (Uzbekista…
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…
The XMM-Newton Serendipitous Survey V. Optical identification of the XMM-Newton Medium sensitivity Survey (XMS)
X. Barcons, F. J. Carrera, M. T. Ceballos +53
We present the XMM-Newton Medium sensitivity Survey (XMS), including a total of 318 X-ray sources found among the serendipitous content of 25 XMM-Newton target fields. The XMS comp…
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://…
Time delay of SBS 0909+532
A. Ullan, L. J. Goicoechea, A. P. Zheleznyak +4
The time delays between the components of a lensed quasar are basic tools to analyze the expansion of the Universe and the structure of the main lens galaxy halo. In this paper, we…