Description
DESI DR2 spectroscopic systematics
The Dark Energy Spectroscopic Instrument (DESI) is conducting an extensive spectroscopic survey to map the large-scale structure of the universe with unprecedented precision. As part of the second data release (DR2), it is essential to quantify and mitigate spectroscopic systematics that could bias cosmological measurements. In this talk, I will present an overview of the spectroscopic systematics identified in the DESI DR2 data, with a particular focus on redshift uncertainties and catastrophic failures. I will discuss how repeat observations are utilized to estimate redshift error distributions and how these corrections are applied to simulated galaxy mocks. Additionally, I will explore the implications of these systematics for galaxy clustering analyses and the measurement of cosmological parameters. Understanding and correcting these biases is crucial not only for two-point statistics but also for advancing beyond-two-point statistics, like three-point-statistics in the analysis of large-scale structure.
