27 May 2019 to 5 June 2019
Cargèse
Europe/Paris timezone

G. Weerasekara: The effect of peculiar motion of galaxies when calculating the gravitational lensing time delay

28 May 2019, 18:50
10m
Amphitheatre (Cargèse)

Amphitheatre

Cargèse

Institut d’Etudes Scientifiques de Cargèse Menasina F-20130 CARGÈSE

Speaker

Mr Gihan Weerasekara (University of Colombo)

Description

An intervening galaxy acts like a gravitational lens and produces multiple images of a single source such as a more remote galaxy. In such a scenario the source, the lens and the observer all have peculiar motions in any random direction in addition to the overall expansion of the universe due to the dark energy. There is a difference in light arriving times from images of a single source, known as the time delay. In calculating such time delays, the peculiar motions of the source, the lens and the observer are generally neglected. In this study, realistic time delays are calculated considering such peculiar motions. The results show that peculiar motions contribute to measurable differences to the observed time delays.

Presentation Materials

Your browser is out of date!

Update your browser to view this website correctly. Update my browser now

×