Events
【DoA Lunch Seminar】March 28th by Zhuowen Zhang (TDLI)
Description
Title：Forward Modeling of Optical Observables for Galaxy Cluster Cosmology
speaker：Zhuowen Zhang
Abstract：
In my talk, I use state-of-the-art simulations to model and quantitatively resolve several of the important systematics for cluster cosmology. First, I quantify the impact of triaxiality, that is, the ellipsoidal shapes and orientations of clusters, on cluster observables and explore the relation between triaxiality and other major systematics such as miscentering and projection effects. Second, I quantify and develop a model for the previously unexplored covariance between cluster observables. The covariance study divides into two parts, one focused on the intrinsic covariance of cluster signals due to the underlying formation physics, and the second that includes a realistic cluster finder to quantify the impact of extrinsic terms due to observational effects on the covariance. These results have been included in the analysis of current optical surveys as DES and will be useful for stage IV cluster surveys as LSST and DESI.
Bio：
Zhuowen Zhang is a TDLI postdoctoral fellow at the TDLI Institute at Shanghai Jiaotong University. He received his PhD from the University of Chicago Astronomy & Astrophysics Department. His research interests lie in probing galaxy clusters at multi-wavelengths in order to constrain the matter density and the evolution history of the universe.
Time: 12:00-13:00, 28/Mar, Friday
Venue: Room 506 (Large seminar room), Department of Astronomy
PS：Lunch will be provided.
