A case devoid of bias: Optical Redshift Survey voids versus IRAS voids |
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| Authors: | H El-Ad T Piran |
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| Institution: | Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA; Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel; Astronomy Department, Columbia University, 550 West 120th Street, New York, NY 10027, USA; Department of Physics, New York University, New York, NY 10003, USA |
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| 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 and an average galaxy underdensity in the voids 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 )void1, showing that on average there is little or no biasing between the two void populations. |
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| Keywords: | galaxies: clusters: general cosmology: observations large-scale structure of Universe |
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