TY - JOUR
T1 - A case devoid of bias
T2 - Optical redshift survey voids versus IRAS voids
AU - El-Ad, H.
AU - Piran, T.
PY - 2000/4/11
Y1 - 2000/4/11
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
UR - http://www.scopus.com/inward/record.url?scp=0040068751&partnerID=8YFLogxK
U2 - 10.1046/j.1365-8711.2000.03286.x
DO - 10.1046/j.1365-8711.2000.03286.x
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AN - SCOPUS:0040068751
SN - 0035-8711
VL - 313
SP - 553
EP - 558
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -