89 citations · 163 across the 5 of their papers we have counts for
9 papers
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…
The dark halo of the main lens galaxy in QSO 0957+561
Luis J. Goicoechea, Rodrigo Gil-Merino, Aurora Ullan
We present an analysis of infrared/optical/ultraviolet spectra of the two images of the first gravitationally lensed quasar Q0957+561A, B. The Hubble Space Telescope observations o…