DESI第一年光谱中内禀对齐引起的红移相关RSD偏差
宇宙学与河外天体物理
2024-01-31 v2
摘要
我们估计了DESI第一年巡天中由亮红星系(LRGs)的潮汐对齐和选择引起的星系取向偏差所产生的红移相关的各向异性聚类信号。为此,我们利用DESI第一年的红移数据,测量了LRG形状与潮汐场之间的相关性,该潮汐场由LRGs和发射线星系(ELGs)追踪。我们还估计了由DESI基于孔径的选择引起的LRG星系取向偏差,并发现由于更红、更暗的星系更接近DESI的成像选择截断,该偏差在红移0.4至1.1之间增加了七倍。这些效应共同导致在10-80 Mpc/h尺度上由结构增长引起的相关函数四极矩测量值在低红移(0.4<z<0.6)处被压低约0.15%,在高红移(0.8<z<1.1)处被压低约0.8%。我们提供了由内禀对齐产生的四极矩信号的估计值,可用于修正这一效应,这对于达到DESI预测的结构增长速率测量精度是必要的。虽然DESI覆盖天区的成像质量存在差异,但我们发现这一效应在Legacy巡天的不同成像区域之间没有显著差异。
引用
@article{arxiv.2312.04518,
title = {Redshift-dependent RSD bias from Intrinsic Alignment with DESI Year 1 Spectra},
author = {Claire Lamman and Daniel Eisenstein and Jessica Nicole Aguilar and Steven Ahlen and David Brooks and Todd Claybaugh and Axel de la Macorra and Arjun Dey and Biprateep Dey and Peter Doel and Simone Ferraro and Andreu Font-Ribera and Jaime E. Forero-Romero and Satya Gontcho A Gontcho and Julien Guy and Robert Kehoe and Anthony Kremin and Laurent Le Guillou and Michael Levi and Marc Manera and Ramon Miquel and Jeffrey A. Newman and Jundan Nie and Nathalie Palanque-Delabrouille and Francisco Prada and Mehdi Rezaie and Graziano Rossi and Eusebio Sanchez and Michael Schubnell and Seo Hee-Jong and Gregory Tarlé and Benjamin Alan Weaver and Zhimin Zhou},
journal= {arXiv preprint arXiv:2312.04518},
year = {2024}
}
备注
9 pages, 1 table, 9 figures. Accepted in MNRAS. For an accessible summary of this paper, see https://cmlamman.github.io/doc/fakeRSD_spectra_summary.pdf