Open AccessClustering of H i galaxies in the H i Parkes All Sky Survey and Arecibo Legacy Fast ALFA Survey
Author(s) -
Passmoor S. S.,
Cress C. M.,
Faltenbacher A.
Publication year - 2011
Publication title -
monthly notices of the royal astronomical society: letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.067
H-Index - 122
eISSN - 1745-3933
pISSN - 1745-3925
DOI - 10.1111/j.1745-3933.2010.01003.x
Subject(s) - sky , cluster analysis , redshift , physics , galaxy , astrophysics , astronomy , dark matter , correlation function (quantum field theory) , mathematics , statistics , optoelectronics , dielectric
We investigate the clustering of H i ‐selected galaxies in the Arecibo Legacy Fast ALFA Survey (ALFALFA) and compare results with those obtained for the H i Parkes All Sky Survey (HIPASS). Measurements of the angular correlation function and the inferred 3D clustering are compared with results from direct spatial‐correlation measurements. We are able to measure clustering on smaller angular scales and for galaxies with lower H i masses than was previously possible. We calculate the expected clustering of dark matter using the redshift distributions of the HIPASS and ALFALFA, and show that the ALFALFA sample is somewhat more antibiased with respect to dark matter than the HIPASS sample.