Systematic Effects in Galaxy-Galaxy Lensing with DESI

作者：J.U Lange, Chris Blake, Christoph Saulder, N Jeffrey, J. DeRose, Gillian D. Beltz-Mohrmann, N Emas, C. García-Quintero, Boryana Hadzhiyska, Sven Heydenreich, Mustapha Ishak, Shahab Joudaki, Eric Jullo, Alex Krolewski, Alexie Leauthaud, L. Medina-Varela, A. Porredon, Graziano Rossi, Rossana Ruggeri, Enia Xhakaj, Sihan Yuan, J. Aguilar, S. P. Ahlen, D. Brooks, T. Claybaugh, Axel de la Macorra, P. Doel, K. Fanning, S Ferraro, Andreu Font-Ribera, J. E. Forero-Romero, E. Gaztañaga, Satya Gontcho A Gontcho, S. Juneau, R. Kehoe, T. Kisner, A. Kremin, Martin Landriau, M. E. Levi, Marc Manera, R. Miquel, John Moustakas, Eva-Maria Mueller, Adam D. Myers, Jundan Nie, Gustavo Niz, N. Palanque‐Delabrouille, Claire Poppett, Mehdi Rezaie, E. Sánchez, M. Schubnell, Hee‐Jong Seo, J. Silber, David Sprayberry, G. Tarlé, M. Vargas-Magaña, Risa H. Wechsler, Zhiming Zhou, Hu Zou · 发表于：The Open Journal of Astrophysics · 年份：2024 · DOI：10.33232/001c.121260 · 被引用次数：7 · 研究领域：Astronomy and Astrophysical Research、Adaptive optics and wavefront sensing、Galaxies: Formation, Evolution, Phenomena

The Dark Energy Spectroscopic Instrument (DESI) survey will measure spectroscopic redshifts for millions of galaxies across roughly 14 , 000 d e g 2 of the sky. Cross-correlating targets in the DESI survey with complementary imaging surveys allows us to measure and analyze shear distortions caused by gravitational lensing in unprecedented detail. In this work, we analyze a series of mock catalogs with ray-traced gravitational lensing and increasing sophistication to estimate systematic effects on galaxy-galaxy lensing estimators such as the tangential shear γ t and the excess surface density Δ Σ . We employ mock catalogs tailored to the specific imaging surveys overlapping with the DESI survey: the Dark Energy Survey (DES), the Hyper Suprime-Cam (HSC) survey, and the Kilo-Degree Survey (KiDS). Among others, we find that fiber incompleteness can have significant effects on galaxy-galaxy lensing estimators but can be corrected effectively by up-weighting DESI targets with fibers by the inverse of the fiber assignment probability. Similarly, we show that intrinsic alignment and lens magnification are expected to be statistically significant given the precision forecasted for the DESI year-1 data set. Our study informs several analysis choices for upcoming cross-correlation studies of DESI with DES, HSC, and KiDS.