Comparison of the ENEAR peculiar velocities with the PSCz gravity field

Adi Nusser; Luiz N. Da Costa; Enzo Branchini; Mariangela Bernardi; M. V. Alonso; Gary Wegner; C. N.A. Willmer; P. S. Pellegrini

doi:10.1046/j.1365-8711.2001.04107.x

Comparison of the ENEAR peculiar velocities with the PSCz gravity field

Adi Nusser, Luiz N. Da Costa, Enzo Branchini, Mariangela Bernardi, M. V. Alonso, Gary Wegner, C. N.A. Willmer, P. S. Pellegrini

Research output: Contribution to journal › Review article › peer-review

30 Scopus citations

Abstract

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 (PSCz). 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 PSCz velocity fields agree well within 6000 km s^-1, assuming a linear biasing relation between the mass and the PSCz galaxies. The comparison allows us to determine the parameter β = Ω^0.6/b, where Ω is the cosmological density parameter and b is the linear biasing factor. A likelihood analysis of the ENEAR and PSCz modes yields β = 0.5 ± 0.1, in good agreement with values obtained from Tully-Fisher surveys.

Original language	English (US)
Pages (from-to)	L21-L24
Journal	Monthly Notices of the Royal Astronomical Society
Volume	320
Issue number	3
DOIs	https://doi.org/10.1046/j.1365-8711.2001.04107.x
State	Published - Jan 21 2001
Externally published	Yes

Keywords

Cosmology: Observations
Dark matter
Large-scale structure of Universe

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1046/j.1365-8711.2001.04107.x

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title = "Comparison of the ENEAR peculiar velocities with the PSCz gravity field",

abstract = "We present a comparison between the peculiar velocity field measured from the ENEAR all-sky Dn-σ catalogue and that derived from the galaxy distribution of the IRAS Point Source Catalog Redshift Survey (PSCz). 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 PSCz velocity fields agree well within 6000 km s-1, assuming a linear biasing relation between the mass and the PSCz galaxies. The comparison allows us to determine the parameter β = Ω0.6/b, where Ω is the cosmological density parameter and b is the linear biasing factor. A likelihood analysis of the ENEAR and PSCz modes yields β = 0.5 ± 0.1, in good agreement with values obtained from Tully-Fisher surveys.",

keywords = "Cosmology: Observations, Dark matter, Large-scale structure of Universe",

author = "Adi Nusser and {Da Costa}, {Luiz N.} and Enzo Branchini and Mariangela Bernardi and Alonso, {M. V.} and Gary Wegner and Willmer, {C. N.A.} and Pellegrini, {P. S.}",

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doi = "10.1046/j.1365-8711.2001.04107.x",

language = "English (US)",

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T1 - Comparison of the ENEAR peculiar velocities with the PSCz gravity field

AU - Nusser, Adi

AU - Da Costa, Luiz N.

AU - Branchini, Enzo

AU - Bernardi, Mariangela

AU - Alonso, M. V.

AU - Wegner, Gary

AU - Willmer, C. N.A.

AU - Pellegrini, P. S.

PY - 2001/1/21

Y1 - 2001/1/21

N2 - We present a comparison between the peculiar velocity field measured from the ENEAR all-sky Dn-σ catalogue and that derived from the galaxy distribution of the IRAS Point Source Catalog Redshift Survey (PSCz). 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 PSCz velocity fields agree well within 6000 km s-1, assuming a linear biasing relation between the mass and the PSCz galaxies. The comparison allows us to determine the parameter β = Ω0.6/b, where Ω is the cosmological density parameter and b is the linear biasing factor. A likelihood analysis of the ENEAR and PSCz modes yields β = 0.5 ± 0.1, in good agreement with values obtained from Tully-Fisher surveys.

AB - We present a comparison between the peculiar velocity field measured from the ENEAR all-sky Dn-σ catalogue and that derived from the galaxy distribution of the IRAS Point Source Catalog Redshift Survey (PSCz). 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 PSCz velocity fields agree well within 6000 km s-1, assuming a linear biasing relation between the mass and the PSCz galaxies. The comparison allows us to determine the parameter β = Ω0.6/b, where Ω is the cosmological density parameter and b is the linear biasing factor. A likelihood analysis of the ENEAR and PSCz modes yields β = 0.5 ± 0.1, in good agreement with values obtained from Tully-Fisher surveys.

KW - Cosmology: Observations

KW - Dark matter

KW - Large-scale structure of Universe

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DO - 10.1046/j.1365-8711.2001.04107.x

M3 - Review article

AN - SCOPUS:0000162957

SN - 0035-8711

VL - 320

SP - L21-L24

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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ER -

Comparison of the ENEAR peculiar velocities with the PSCz gravity field

Abstract

Keywords

ASJC Scopus subject areas

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