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« Searching for Strong Lenses to Probe Dark Matter Substructures »

James Hung-Hsu Chan
Laboratoire d'Astrophysique, Ecole Polytechnique Fédérale de Lausanne (Lausanne, Suisse)

Strong gravitationally lensed quasars provide powerful means to study galaxy structures/substructures. Current and upcoming imaging surveys will contain thousands of new lensed quasars, augmenting the existing sample by around two orders of magnitude.
We have built a lens hunter - CHITAH - to search for new lensed quasars in Hyper Suprime-Cam (HSC) survey. Through flux measurements of multiple lensed quasar images, we can understand the size scale and the abundance of substructures of dark matter, and further compare different dark matter models: cold dark matter (CDM) and wave-like dark matter (?DM).

mardi 18 juin 2019 - 11:15
Salle 281, Institut d'Astrophysique
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