Poster Presentation

Measurement of the Time Delay of the Gravitationally Lensed Blazar PKS 1830–211 by Fermi-LAT

Author(s): Mitsuki Mori (Ritsumeikan University), Masaki Mori (Ritsumeikan University)

Presenter: Mitsuki Mori (Ritsumeikan University)

Massive objects curve space-time and bend the path of light. If a massive galaxy lies near our line of sight to a distant source, the light is deflected toward us, making the source appear brighter or even producing multiple images. This phenomenon is called gravitational lensing. In addition to magnifying the source, gravitational lensing can introduce a characteristic time delay between the multiple images. PKS 1830–211 is one of only two known γ-ray bright blazars that are gravitationally lensed. In this study, I constructed its γ-ray light curve using Fermi-LAT data and searched for signatures of such a lensing-induced time delay.