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Gaia GraL: Gaia DR2 Gravitational Lens Systems. IV. Keck/LRIS spectroscopic confirmation of GRAL113100-441959 and model prediction of time-delays
Olivier Wertz, Daniel Stern, Alberto Krone-Martins +14
We report the spectroscopic confirmation and modeling of the quadruply imaged quasar GRAL113100-441959, the first gravitational lens (GL) to be discovered mainly from astrometric c…
Gaia GraL: Gaia DR2 Gravitational Lens Systems. III. A systematic blind search for new lensed systems
L. Delchambre, A. Krone-Martins, O. Wertz +13
Aims: In this work, we aim to provide a reliable list of gravitational lens (GL) candidates based on a search performed over the entire Gaia Data Release 2 (Gaia DR2). We also show…
pySPT: a package dedicated to the source position transformation
Olivier Wertz, Bastian Orthen
The modern time-delay cosmography aims to infer the cosmological parameters with a competitive precision from observing a multiply imaged quasar. The success of this technique reli…
Ambiguities in gravitational lens models: impact on time delays of the source position transformation
Olivier Wertz, Bastian Orthen, Peter Schneider
The central ambition of the modern time delay cosmography consists in determining the Hubble constant with a competitive precision. However, the tension with obtained f…
Flux and color variations of the doubly imaged quasar UM673
D. Ricci, A. Elyiv, F. Finet +42
With the aim of characterizing the flux and color variations of the multiple components of the gravitationally lensed quasar UM673 as a function of time, we have performed multi-ep…