| Speaker: | Navin Chaurasiya (Inter-University Center for Astronomy and Astrophysics （ IUCAA）) |
|---|---|
| Title: | Galaxy dark matter connection from the Subaru Hyper Suprime Cam survey weak lensing observations |
| Date (JST): | Thu, Mar 28, 2024, 13:30 - 15:00 |
| Place: | Seminar Room A |
| Abstract: | We investigate the connection between the galaxy and their dark matter halos and how it evolves with time. Utilizing the excellent depth of the Subaru Hyper Suprime Cam Survey (HSC), we measure the masses of dark matter halos which host HSC galaxies using the technique of weak gravitational lensing. We bin galaxies in variety of stellar mass threshold bins ranging from $\log M_* = [8.6, 11.2]$ in two redshift bins $z=[0.3, 0.55]$ and $[0.55, 0.8]$ and analyse the weak lensing signals in the context of the halo occupation distribution model to infer the scaling relation between stellar mass of galaxies and their halo mass. I will also comment on the systematics involved in the measurements of the weak lensing signal, especially due to the use of lens galaxies with photometric redshifts. If time permits I will also present our efforts to test models of galaxy assembly bias using the HSC weak lensing signals of galaxies from DESI. |
