Open AccessComparison of the ENEAR peculiar velocities with the PSC z gravity field
Author(s) -
Nusser Adi,
Da Costa Luiz N.,
Branchini Enzo,
Bernardi Mariangela,
Alonso M.V.,
Wegner Gary,
Willmer C. N. A.,
Pellegrini P. S.
Publication year - 2001
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2001.04107.x
Subject(s) - physics , redshift , astrophysics , redshift survey , galaxy , peculiar velocity , sky , redshift space distortions , field (mathematics) , field galaxy , mathematics , pure mathematics
We present a comparison between the peculiar velocity field measured from the ENEAR all‐sky D n – σ catalogue and that derived from the galaxy distribution of the IRAS Point Source Catalog Redshift Survey (PSC z ). The analysis is based on a modal expansion of these data in redshift space by means of spherical harmonics and Bessel functions. The effective smoothing scale of the expansion is almost linear with redshift reaching 1500 km s −1 at 3000 km s −1 . The general flow patterns in the filtered ENEAR and PSC z velocity fields agree well within 6000 km s −1 , assuming a linear biasing relation between the mass and the PSC z galaxies. The comparison allows us to determine the parameter where Ω is the cosmological density parameter and b is the linear biasing factor. A likelihood analysis of the ENEAR and PSC z modes yields in good agreement with values obtained from Tully–Fisher surveys.