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Title: Probing Galaxy assembly bias in BOSS galaxies using void probabilities

Abstract

ABSTRACT We measure the void probability function (VPF) of galaxies in the Baryon Oscillation Spectroscopic Survey (BOSS). The VPF provides complementary information to standard two-point statistics in that it is sensitive to galaxy bias in the most extreme underdensities in the cosmic web. Thus, the VPF is ideal for testing whether halo occupation of galaxies depends on large-scale density, an effect known as galaxy assembly bias. We find that standard HOD model – one parameterized by halo mass only – fit only to the two-point function, accurately predicts the VPF. Additionally, for HOD models where density dependence is explicitly incorporated, the best-fitting models fit to the combination of the correlation function and the VPF have zero density dependence. Thus, galaxy assembly bias is not a strong source of systematic uncertainty when modelling the clustering of massive galaxies.

Authors:
 [1];  [1]
  1. Center for Cosmology and Particle Physics, Department of Physics, New York University, New York
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1532816
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: 488 Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Walsh, Kilian, and Tinker, Jeremy. Probing Galaxy assembly bias in BOSS galaxies using void probabilities. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz1351.
Walsh, Kilian, & Tinker, Jeremy. Probing Galaxy assembly bias in BOSS galaxies using void probabilities. United Kingdom. doi:10.1093/mnras/stz1351.
Walsh, Kilian, and Tinker, Jeremy. Thu . "Probing Galaxy assembly bias in BOSS galaxies using void probabilities". United Kingdom. doi:10.1093/mnras/stz1351.
@article{osti_1532816,
title = {Probing Galaxy assembly bias in BOSS galaxies using void probabilities},
author = {Walsh, Kilian and Tinker, Jeremy},
abstractNote = {ABSTRACT We measure the void probability function (VPF) of galaxies in the Baryon Oscillation Spectroscopic Survey (BOSS). The VPF provides complementary information to standard two-point statistics in that it is sensitive to galaxy bias in the most extreme underdensities in the cosmic web. Thus, the VPF is ideal for testing whether halo occupation of galaxies depends on large-scale density, an effect known as galaxy assembly bias. We find that standard HOD model – one parameterized by halo mass only – fit only to the two-point function, accurately predicts the VPF. Additionally, for HOD models where density dependence is explicitly incorporated, the best-fitting models fit to the combination of the correlation function and the VPF have zero density dependence. Thus, galaxy assembly bias is not a strong source of systematic uncertainty when modelling the clustering of massive galaxies.},
doi = {10.1093/mnras/stz1351},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 488,
place = {United Kingdom},
year = {2019},
month = {5}
}

Journal Article:
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This content will become publicly available on May 16, 2020
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