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HEP-Astro Seminar | Galaxy-Galaxy Lensing and Lensing Ratios for Cosmological Analyses in the Dark Energy Survey

Judit Prat (University of Chicago)
Monday, September 27, 2021
4:00-5:00 PM
335 West Hall Map
Galaxy cosmic surveys such as the Dark Energy Survey are a powerful tool to extract cosmological information. In particular, the combination of weak lensing and galaxy clustering measurements, usually known as 3x2pt, provides a potent and robust way to constrain the parameters controlling the structure formation in the late Universe. In this talk I will give an overview of the results and methods of Dark Energy Survey Y3 3x2pt cosmological analysis, focusing specially on the galaxy-galaxy lensing probe, which is the cross-correlation of the shapes of source background galaxies with lens foreground galaxy positions. I will also describe how we can construct suitable ratios of these galaxy-galaxy lensing measurements to exploit the otherwise usually disregarded small-scale information and naturally integrate it as part of the 3x2pt analysis. Finally, I will highlight some other galaxy-galaxy lensing applications, including learning about the galaxy-halo connection and low-surface brightness galaxies.
Building: West Hall
Event Type: Workshop / Seminar
Tags: Physics, Science
Source: Happening @ Michigan from Department of Physics, HEP - Astro Seminars