A case devoid of bias: Optical redshift survey voids versus IRAS voids

H. El-Ad; T. Piran

doi:10.1046/j.1365-8711.2000.03286.x

A case devoid of bias: Optical redshift survey voids versus IRAS voids

H. El-Ad^*
, T. Piran

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

We present a comparison between the voids in two nearly all-sky redshift surveys: the Optical Redshift Survey (ORS) and the IRAS 1.2-Jy survey. While the galaxies in these surveys are selected differently and their populations are known to be biased relative to each other, the two void distributions are similar. We compare the spatial distribution of the two void populations and demonstrate the correlation between them. The voids also agree with regard to the overall void statistics - a filling factor of ≈0.45 of the volume, an average void diameter d̄_void ≈ 45h^-1 Mpc and an average galaxy underdensity in the voids δ̄ ≈ -0.9. Our measurements of the underdensities of the voids in the two surveys enable us to estimate the relative bias in the voids between optical and IRAS samples. We find (b_opt/b_IRAS)^void ≈ 1, showing that on average there is little - or no - biasing between the two void populations.

Original language	English
Pages (from-to)	553-558
Number of pages	6
Journal	Monthly Notices of the Royal Astronomical Society
Volume	313
Issue number	3
DOIs	https://doi.org/10.1046/j.1365-8711.2000.03286.x
State	Published - 11 Apr 2000

Keywords

Cosmology: Observations
Galaxies: Clusters: General
Large-scale structure of Universe

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10.1046/j.1365-8711.2000.03286.x

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title = "A case devoid of bias: Optical redshift survey voids versus IRAS voids",

abstract = "We present a comparison between the voids in two nearly all-sky redshift surveys: the Optical Redshift Survey (ORS) and the IRAS 1.2-Jy survey. While the galaxies in these surveys are selected differently and their populations are known to be biased relative to each other, the two void distributions are similar. We compare the spatial distribution of the two void populations and demonstrate the correlation between them. The voids also agree with regard to the overall void statistics - a filling factor of ≈0.45 of the volume, an average void diameter {\=d}void ≈ 45h-1 Mpc and an average galaxy underdensity in the voids {\=δ} ≈ -0.9. Our measurements of the underdensities of the voids in the two surveys enable us to estimate the relative bias in the voids between optical and IRAS samples. We find (bopt/bIRAS)void ≈ 1, showing that on average there is little - or no - biasing between the two void populations.",

keywords = "Cosmology: Observations, Galaxies: Clusters: General, Large-scale structure of Universe",

author = "H. El-Ad and T. Piran",

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AU - Piran, T.

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N2 - We present a comparison between the voids in two nearly all-sky redshift surveys: the Optical Redshift Survey (ORS) and the IRAS 1.2-Jy survey. While the galaxies in these surveys are selected differently and their populations are known to be biased relative to each other, the two void distributions are similar. We compare the spatial distribution of the two void populations and demonstrate the correlation between them. The voids also agree with regard to the overall void statistics - a filling factor of ≈0.45 of the volume, an average void diameter d̄void ≈ 45h-1 Mpc and an average galaxy underdensity in the voids δ̄ ≈ -0.9. Our measurements of the underdensities of the voids in the two surveys enable us to estimate the relative bias in the voids between optical and IRAS samples. We find (bopt/bIRAS)void ≈ 1, showing that on average there is little - or no - biasing between the two void populations.

AB - We present a comparison between the voids in two nearly all-sky redshift surveys: the Optical Redshift Survey (ORS) and the IRAS 1.2-Jy survey. While the galaxies in these surveys are selected differently and their populations are known to be biased relative to each other, the two void distributions are similar. We compare the spatial distribution of the two void populations and demonstrate the correlation between them. The voids also agree with regard to the overall void statistics - a filling factor of ≈0.45 of the volume, an average void diameter d̄void ≈ 45h-1 Mpc and an average galaxy underdensity in the voids δ̄ ≈ -0.9. Our measurements of the underdensities of the voids in the two surveys enable us to estimate the relative bias in the voids between optical and IRAS samples. We find (bopt/bIRAS)void ≈ 1, showing that on average there is little - or no - biasing between the two void populations.

KW - Cosmology: Observations

KW - Galaxies: Clusters: General

KW - Large-scale structure of Universe

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A case devoid of bias: Optical redshift survey voids versus IRAS voids

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