Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-04
Mon.Not.Roy.Astron.Soc. 367 (2006) 1251-1260
Astronomy and Astrophysics
Astrophysics
10 pages, 10 figures, accepted for publication in MNRAS, minor typos fixed and references updated
Scientific paper
10.1111/j.1365-2966.2006.10010.x
The HI Parkes All Sky Survey (HIPASS) galaxy catalogue is cross-correlated with known low redshift, low column density (N_HI <10^15 cm^-2) Lyman-alpha absorbers from the literature. The redshift-space correlation is found to be similar in strength to HIPASS galaxy self-clustering (correlation length s_0,ag=6+/-4 and s_0,gg=3.1+/-0.5 h^-1 Mpc respectively). In real-space the cross-correlation is stronger than the galaxy auto-correlation (correlation length r_0,ag=7.2+/-1.4 and r_0,gg=3.5+/-0.7 h^-1 Mpc respectively) on scales from 1-10 h^-1 Mpc, ruling out the mini-halo model for the confinement Lyman-alpha absorbers at the 99 percent confidence level. Provided that the cause of the strong cross-correlation is purely gravitational, the ratio of correlation lengths suggest that absorbers are embedded in dark matter haloes with masses log(M/Msun)=14.2 h^-1, similar to those of galaxy groups. The flattening of the cross-correlation at separations less than ~600 h^-1 kpc could correspond to the thickness of filaments in which absorbers are embedded. This work provides indirect statistical evidence for the notion that galaxy groups and large-scale filaments, particularly those that comprise gas-rich galaxies, are the dominant environments of low column density Lyman-alpha absorbers at z=0.
No associations
LandOfFree
Cross correlation of Lyman-alpha absorbers with gas-rich galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cross correlation of Lyman-alpha absorbers with gas-rich galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cross correlation of Lyman-alpha absorbers with gas-rich galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-305669