학술논문
ELG Spectroscopic Systematics Analysis of the DESI Data Release 1
Document Type
Working Paper
Author
Yu, Jiaxi; Ross, Ashley J.; Rocher, Antoine; Alves, Otávio; de Mattia, Arnaud; Forero-Sánchez, Daniel; Kneib, Jean-Paul; Krolewski, Alex; Lan, TingWen; Rashkovetskyi, Michael; Aguilar, Jessica Nicole; Ahlen, Steven; Bailey, Stephen; Brooks, David; Chaussidon, Edmond; Claybaugh, Todd; de la Macorra, Axel; Dey, Arjun; Dey, Biprateep; Doel, Peter; Fanning, Kevin; Forero-Romero, Jaime E.; Gaztañaga, Enrique; Gontcho, Satya Gontcho A; Honscheid, Klaus; Howlett, Cullan; Juneau, Stephanie; Kisner, Theodore; Kremin, Anthony; Lambert, Andrew; Landriau, Martin; Guillou, Laurent Le; Levi, Michael E.; Manera, Marc; Martini, Paul; Meisner, Aaron; Miquel, Ramon; Moustakas, John; Mueller, Eva-Maria; Muñoz-Gutiérrez, Andrea; Myers, Adam D.; Nie, Jundan; Niz, Gustavo; Palanque-Delabrouille, Nathalie; Percival, Will J.; Poppett, Claire; Prada, Francisco; Rezaie, Mehdi; Rossi, Graziano; Sanchez, Eusebio; Schlafly, Edward F.; Schlegel, David; Schubnell, Michael; Seo, Hee-Jong; Sprayberry, David; Tarlé, Gregory; Weaver, Benjamin A.; Zarrouk, Pauline; Zhao, Cheng; Zhou, Rongpu; Zou, Hu
Source
Subject
Language
Abstract
Dark Energy Spectroscopic Instrument (DESI) uses more than 2.4 million Emission Line Galaxies (ELGs) for 3D large-scale structure (LSS) analyses in its Data Release 1 (DR1). Such large statistics enable thorough research on systematic uncertainties. In this study, we focus on spectroscopic systematics of ELGs. The redshift success rate ($f_{\rm goodz}$) is the relative fraction of secure redshifts among all measurements. It depends on observing conditions, thus introduces non-cosmological variations to the LSS. We, therefore, develop the redshift failure weight ($w_{\rm zfail}$) and a per-fibre correction ($\eta_{\rm zfail}$) to mitigate these dependences. They have minor influences on the galaxy clustering. For ELGs with a secure redshift, there are two subtypes of systematics: 1) catastrophics (large) that only occur in a few samples; 2) redshift uncertainty (small) that exists for all samples. The catastrophics represent 0.26\% of the total DR1 ELGs, composed of the confusion between O\,\textsc{ii} and sky residuals, double objects, total catastrophics and others. We simulate the realistic 0.26\% catastrophics of DR1 ELGs, the hypothetical 1\% catastrophics, and the truncation of the contaminated $1.31