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Title: Tests of acoustic scale shifts in halo-based mock galaxy catalogues

Abstract

ABSTRACT We utilize mock catalogues from high-accuracy cosmological N-body simulations to quantify shifts in the recovery of the acoustic scale that could potentially result from galaxy clustering bias. The relationship between galaxies and dark matter haloes presents a complicated source of systematic errors in modern redshift surveys, particularly when aiming to make cosmological measurements to sub-per cent precision. Apart from a scalar, linear bias parameter accounting for the density contrast ratio between matter tracers and the true matter distribution, other types of galaxy bias, such as assembly and velocity biases, may also significantly alter clustering signals from small to large scales. We create mocks based on generalized halo occupation populations of 36 periodic boxes from the abacus cosmosrelease, and test various biased models along with an unbiased base case in a total volume of $$48 \, h^{-3} \, {\rm Gpc}^{3}$$. Two reconstruction methods are applied to galaxy samples and the apparent acoustic scale is derived by fitting the two-point correlation function multipoles. With respect to the baseline, we find a 0.3 per cent shift in the line-of-sight acoustic scale for one variation in the satellite galaxy population, and we find a 0.7 per cent shift for an extreme level of velocity bias of the central galaxies. All other bias models are consistent with zero shift at the 0.2 per cent level after reconstruction. We note that the bias models explored are relatively large variations, producing sizeable and likely distinguishable changes in small-scale clustering, the modelling of which would further calibrate the baryon acoustic oscillations standard ruler.

Authors:
 [1];  [2]
  1. Physics Department, Boston University, 590 Commonwealth Ave, Boston, MA 02215, USA
  2. Institute for Theory and Computation, Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1572434
Grant/Contract Number:  
SC0013718; SC0015628
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 490 Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Duan, Yutong, and Eisenstein, Daniel. Tests of acoustic scale shifts in halo-based mock galaxy catalogues. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz2578.
Duan, Yutong, & Eisenstein, Daniel. Tests of acoustic scale shifts in halo-based mock galaxy catalogues. United Kingdom. doi:10.1093/mnras/stz2578.
Duan, Yutong, and Eisenstein, Daniel. Mon . "Tests of acoustic scale shifts in halo-based mock galaxy catalogues". United Kingdom. doi:10.1093/mnras/stz2578.
@article{osti_1572434,
title = {Tests of acoustic scale shifts in halo-based mock galaxy catalogues},
author = {Duan, Yutong and Eisenstein, Daniel},
abstractNote = {ABSTRACT We utilize mock catalogues from high-accuracy cosmological N-body simulations to quantify shifts in the recovery of the acoustic scale that could potentially result from galaxy clustering bias. The relationship between galaxies and dark matter haloes presents a complicated source of systematic errors in modern redshift surveys, particularly when aiming to make cosmological measurements to sub-per cent precision. Apart from a scalar, linear bias parameter accounting for the density contrast ratio between matter tracers and the true matter distribution, other types of galaxy bias, such as assembly and velocity biases, may also significantly alter clustering signals from small to large scales. We create mocks based on generalized halo occupation populations of 36 periodic boxes from the abacus cosmosrelease, and test various biased models along with an unbiased base case in a total volume of $48 \, h^{-3} \, {\rm Gpc}^{3}$. Two reconstruction methods are applied to galaxy samples and the apparent acoustic scale is derived by fitting the two-point correlation function multipoles. With respect to the baseline, we find a 0.3 per cent shift in the line-of-sight acoustic scale for one variation in the satellite galaxy population, and we find a 0.7 per cent shift for an extreme level of velocity bias of the central galaxies. All other bias models are consistent with zero shift at the 0.2 per cent level after reconstruction. We note that the bias models explored are relatively large variations, producing sizeable and likely distinguishable changes in small-scale clustering, the modelling of which would further calibrate the baryon acoustic oscillations standard ruler.},
doi = {10.1093/mnras/stz2578},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 490,
place = {United Kingdom},
year = {2019},
month = {9}
}

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