DUCOURANT, C.; KRONE-MARTINS, A.; DELCHAMBRE, L.; WERTZ, O.; GALLUCCIO, Laurent; TEIXEIRA, R.; LE CAMPION, J.-F.; SCARANO, S.; GRAHAM, M. J.; DJORGOVSKI, S. G.; STERN, D.; SLEZAK, E.; SPINDOLA-DUARTE, C.; SURDEJ, J.; MIGNARD, F.; BASTIAN, U.; WAMBSGANSS, J.; KLÜTER, J.; BOEHM, C.

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Licencia de uso del documento

DUCOURANT, C.
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

KRONE-MARTINS, A.

DELCHAMBRE, L.

Idioma

Communication dans un congrès

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SF2A, 2019-05-14, Nice.

Resumen en inglés

Gaia was mainly designed for the study of stars in our Galaxy. However, by continuously scanning the entire sky, it also provides informations on all kind of objects that fall in its fields of view, including extragalactic objects. Amongst these extragalactic sources, quasars stand out to be some of the most peculiar objects that Gaia observe. Beside the fact that they play a crucial role in fixing the Gaia Celestial Reference Frame, they also have their intrinsic interest in cosmology. One of their important application occurs when a massive galaxy stands along the line of sight joining the quasar and the observer as, in this case, multiple images of this quasar may form. The time delays measurement between these lensed images then provide a reliable estimation of H0 that is independent of the commonly used cosmic distance ladder. We describe here how the precise relative positions and magnitudes, as provided by Gaia, can be used in order to probe the lensing nature of clusters of objects coming from the Gaia DR2. We present some newly discovered lenses that were spectroscopically confirmed in recent follow-up observations.< Leer menos

Palabras clave en inglés

Gravitational lensing: strong

Quasars: general

Astrometry

Methods: data analysis

Catalogues

Surveys

Orígen

Importado de Hal

Centros de investigación

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804