Astro Lunch Seminar

Speaker: Divya Rana (IUCAA)
Title: Subaru Hyper Suprime-Cam view of the Universe: Galaxy-dark matter connection and the boundaries of dark matter halos
Date (JST): Tue, Oct 18, 2022, 11:00 - 12:00
Place: Hybrid
Abstract: Dark matter forms the backbone of the cosmic web, in which galaxies form and evolve over cosmic time and assemble to form groups and the massive clusters of galaxies we see today. The Hyper Suprime-Cam (HSC) survey provides high-quality imaging data at an unprecedented depth spanning a wide sky area which is well suited to carry out weak lensing studies. We will use these techniques to probe the dark matter distribution and explore its connection with the observable universe. These correlations will be discussed with the help of weak lensing calibrated halo masses for GAMA galaxies and groups obtained using the first year HSC shape catalog. I will present the
scaling relations between the dark matter masses of galaxy groups and their observable properties such as the group luminosity and velocity dispersion, as well as those between the sizes of galaxies and their dark matter halos. Finally I will also present the tightest constraints on the location of the splashback radius using X-ray clusters selected from the eROSITA eFEDS. I will then talk about the agreement with expectations from the ΛCDM model and compare it with previous works in the literature.