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arXiv 2312.04518astro-ph.CO
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利用DESI第一年光谱研究内禀对齐导致的与红移相关的RSD偏差

Redshift-dependent RSD bias from Intrinsic Alignment with DESI Year 1 Spectra

Claire Lamman, Daniel Eisenstein, Jessica Nicole Aguilar, Steven Ahlen, David Brooks, Todd Claybaugh, Axel de la Macorra, Arjun Dey, Biprateep Dey, Peter Doel, … 展开作者

Claire Lamman, Daniel Eisenstein, Jessica Nicole Aguilar, Steven Ahlen, David Brooks, Todd Claybaugh, Axel de la Macorra, Arjun Dey, Biprateep Dey, Peter Doel, Simone Ferraro, Andreu Font-Ribera, Jaime E. Forero-Romero, Satya Gontcho A Gontcho, Julien Guy, Robert Kehoe, Anthony Kremin, Laurent Le Guillou, Michael Levi, Marc Manera, Ramon Miquel, Jeffrey A. Newman, Jundan Nie, Nathalie Palanque-Delabrouille, Francisco Prada, Mehdi Rezaie, Graziano Rossi, Eusebio Sanchez, Michael Schubnell, Seo Hee-Jong, Gregory Tarlé, Benjamin Alan Weaver, Zhimin Zhou

AI总结:

本研究利用DESI第一年光谱数据,分析亮红星系内禀对齐与选择效应诱导的取向偏差带来的红移相关RSD偏差,给出四极矩信号校正值,为实现结构增长速率的高精度测量提供支持。

摘要:

我们估算了暗能量光谱仪(DESI)第一年巡天中,由亮红星系(LRGs)的潮汐对齐以及选择效应诱导的星系取向偏差所产生的与红移相关的各向异性成团信号。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,其中潮汐场由LRG和发射线星系(ELGs)示踪。我们还估算了由DESI基于孔径的选择效应导致的LRG星系取向偏差,发现由于更红、更暗的星系更接近DESI的成像选择阈值,该偏差在红移0.4到1.1之间增加了7倍。这些效应共同作用,会抑制由结构增长导致的、尺度为10-80 Mpc/h的相关函数四极矩测量值,在低红移(0.4<z<0.6)时约为0.15%,在高红移(0.8<z<1.1)时约为0.8%。我们提供了由内禀对齐产生的四极矩信号的估算值,可用于校正这一效应,这对于实现DESI预测的结构增长速率测量精度是必要的。尽管DESI天区的成像质量存在差异,但我们发现在Legacy成像巡天的不同成像区域之间,这一效应没有显著差异。

英文摘要:

We estimate the redshift-dependent, anisotropic clustering signal in DESI's Year 1 Survey created by tidal alignments of Luminous Red Galaxies (LRGs) and a selection-induced galaxy orientation bias. To this end, we measured the correlation between LRG shapes and the tidal field with DESI's Year 1 redshifts, as traced by LRGs and Emission-Line Galaxies (ELGs). We also estimate the galaxy orientation bias of LRGs caused by DESI's aperture-based selection, and find it to increase by a factor of seven between redshifts 0.4 - 1.1 due to redder, fainter galaxies falling closer to DESI's imaging selection cuts. These effects combine to dampen measurements of the quadrupole of the correlation function caused by structure growth on scales of 10 - 80 Mpc/h by about 0.15% for low redshifts (0.4<z<0.6) and 0.8% for high (0.8<z<1.1). We provide estimates of the quadrupole signal created by intrinsic alignments that can be used to correct this effect, which is necessary to meet DESI's forecasted precision on measuring the growth rate of structure. While imaging quality varies across DESI's footprint, we find no significant difference in this effect between imaging regions in the Legacy Imaging Survey.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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