Caustic-Crossing Events in Cluster Lenses


  Ashish Kumar Meena  
Ben-Gurion University of the Negev

The detection of several caustic crossing (CC) events in galaxy cluster fields opened a new window to observe individual stars at cosmological distances. Many more such events are expected soon from dedicated campaigns with the Hubble Space Telescope and from the James Webb Space Telescope. These events can teach us not only about the lensed sources but also about the point mass function of the lens and thus, potentially, the composition of dark matter. In my talk, I will discuss the basic idea behind these CC events. After that, I will discuss how the presence of compact objects in the intracluster medium can introduce numerous peaks in the light curve. In the end, I will discuss a simple and efficient method to simulate these CC events.