Constraining galaxy–halo connection with high-order statistics. Issue 4 (31st July 2022)

• Record Type: Journal Article
• Authors: Zhang, Hanyu; Samushia, Lado; Brooks, David; de la Macorra, Axel; Doel, Peter; Gaztañaga, Enrique; Gontcho A Gontcho, Satya; Honscheid, Klaus; Kehoe, Robert; Kisner, Theodore; Meisner, Aaron; Poppett, Claire; Schubnell, Michael; Tarle, Gregory; Zhang, Kai; Zou, Hu
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 515:Issue 4(2022)
• Page Start: 6133
• Page End: 6150
• Publication Date: 2022-07-31
• Subjects: cosmology: theory -- galaxies: haloes -- large-scale structure of Universe; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stac2147
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We investigate using three-point statistics in constraining the galaxy–halo connection. We show that for some galaxy samples, the constraints on the halo occupation distribution parameters are dominated by the three-point function signal (over its two-point counterpart). We demonstrate this on mock catalogues corresponding to the Luminous red galaxies (LRGs), Emission-line galaxies (ELGs), and quasars (QSOs) targeted by the Dark Energy Spectroscopic Instrument (DESI) Survey. The projected three-point function for triangle sides less up to 20 h −1 Mpc measured from a cubic Gpc of data can constrain the characteristic minimum mass of the LRGs with a preci sion of 0.46 per cent. For comparison, similar constraints from the projected two-point function are 1.55 per cent. The improvements for the ELGs and QSOs targets are more modest. In the case of the QSOs, it is caused by the high shot-noise of the sample, and in the case of the ELGs, it is caused by the range of halo masses of the host haloes. The most time-consuming part of our pipeline is the measurement of the three-point functions. We adopt a tabulation method, proposed in earlier works for the two-point function, to significantly reduce the required compute time for the three-point analysis.