Redshift-dependent RSD bias from intrinsic alignment with DESI Year 1 spectra

1Citations
Citations of this article
6Readers
Mendeley users who have this article in their library.

Abstract

We estimate the redshift-dependent, anisotropic clustering signal in the Dark Energy Spectroscopic Instrument (DESI) Year 1 Surv e y 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. 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 ( ξ2 ) caused by structure growth on scales of 10-80 h -1 Mpc by about 0.15 per cent for low redshifts (0.4 < z < 0.6) and 0.8 per cent for high (0.8 < z < 1.1), a significant fraction of DESI's error budget. We provide estimates of the ξ2 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.

Cite

CITATION STYLE

APA

Lamman, C., Eisenstein, D., Aguilar, J. N., Ahlen, S., Brooks, D., Claybaugh, T., … Zhou, Z. (2024). Redshift-dependent RSD bias from intrinsic alignment with DESI Year 1 spectra. Monthly Notices of the Royal Astronomical Society, 528(4), 6559–6567. https://doi.org/10.1093/mnras/stae317

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free