2-point Correlation Function of HI-selected Galaxies

2001/10/30 by S. Tantisrisuk, Tantisrisuk, S., R. L. Webster +2
Economics, Econometrics and Finance · Mathematics · Physics and Astronomy · #Advanced Statistical Methods and Models #Astrophysics (astro-ph) #FOS: Physical sciences #Regional Economic and Spatial Analysis #Spatial and Panel Data Analysis #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/0110638

2 pages, 2 postscript figures

arxiv created 2001/10/30 · openalex publication_date 2001/10/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The 2-point spatial correlation function (CF), ξ(s), has been used to study the clustering of the galaxies in the preliminary version of the HIPASS Bright Galaxy Catalogue (HIPASS BGC), which includes the 1,000 HI brightest galaxies in the Southern sky. This is the first time the CF has been used to analyse an HI-selected sample. The CF is well described by a power law, ξ(s)∼(s/s₀)^-γ, with slope γ∼1.7 and correlation length s₀∼3.55 h^-1 Mpc using Peebles estimator. However, when the Hamilton estimator is used, the CF is fit with γ∼2.19 and s₀∼3.37 h^-1 Mpc. Note that, these HI-selected galaxies show less clustering than optically-selected surveys which have a correlation length s₀∼ 5.5 h^-1 Mpc or larger.

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