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Special Cosmology Seminar

The Euclid Spectroscopic Systematics Challenge
Presented by Katarina (Dida) Markovič
Institute of Cosmology and Gravitation (ICG), University of Portsmouth, UK

Friday, February 23, 2018
11:00 A.M. in 169-336

Abstract
In the early 2020s the Euclid space telescope will be launched. From the second Lagrangian point in far Earth orbit, it will survey the full extragalactic sky. The mission's goal will be nothing less than understanding the dark universe. This talk will briefly overview Euclid's main scientific goals and review the tools we are building that will enable us to probe the expansion history of our universe, as well as the nature of gravity. The talk will specifically focus on the galaxy clustering probe and discuss its challenges. The Euclid spectroscopic survey will measure redshifts of galaxies on 15,000 square degrees of the sky using slitless spectroscopy, so it will no longer be limited by statistics as much as it will be challenged by systematics. In order to prepare for this, we have built a pipeline to simulate the procedure of measurement from start to finish, i.e. end-to-end simulations. The simulated catalogues we output emulate the redshift catalogues that will be produced by the true Euclid. We do this on a smaller scale - to pixel-level precision, and approximately for simulating significant parts of the sky. Such mock measured catalogues serve as a basis for optimizing the survey strategy, and developing data analysis tools for mitigating systematic effects. They help us understand the Euclid scientific performance in the case we do or do not successfully model or mitigate systematic effects.

JPL Contact: If you would like to meet with the speaker, contact Jason Rhodes (4-3304).


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