2006/02/03 by S. Basilakos, Spyros Basilakos, K. Kovac +11
Chemistry · Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Scientific Research and Discoveries #Spectroscopy and Laser Applications #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0602073
The definitive version of this manuscript will be submitted in a few weeks time after the authors have fixed a few omissions
openalex publication_date 2006/02/03 · arxiv created 2006/02/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the clustering properties of the recently compiled HIPASS neutral hydrogen (HI) sources catalogue using the two point correlation function in redshift space. If the two point correlation is modelled as a power law, ξ(r)=(r0/r)γ, then the best-fitting parameters for the HI selected galaxies are r0=4.3 ± 0.3 h-1 Mpc with γ=1.42 ± 0.14. Fixing the slope to its universal value γ=1.8, we obtain r0= 4.1+0.2-0.3 h-1 Mpc. Comparing the measured two point correlation function with the predictions of the concordance cosmological model, we find that at the present epoch the HI selected galaxies are anti-biased with respect to the underline matter fluctuation field with bias value being b0≃ 0.63. Also, we investigate the evolution of the linear bias factor, b(z), and we find to be a strongly dependent function of redshift. Finally, we estimate the HI selected galaxies redshift space distortion parameter β≃ Ω\rm m0.6/b0 in order to correct the correlation function for the peculiar motions and we find β≃ 0.77. Taking into account the corrections for the redshift space distortions the HI correlation length in real space is r\rm re0=3+0.4-0.3h-1Mpc for γ=1.42 while using γ=1.8 we get r\rm re0= 3.1 ± 0.3 h-1Mpc.