The large-scale distribution of IRAS galaxies and the predicted peculiar velocity field

N. Kaiser; G. Efstathiou; W. Saunders; R. Ellis; C. Frenk; A. Lawrence; M. Rowan-Robinson

doi:10.1093/mnras/252.1.1

The large-scale distribution of IRAS galaxies and the predicted peculiar velocity field

N. Kaiser, G. Efstathiou, W. Saunders, R. Ellis, C. Frenk, A. Lawrence, M. Rowan-Robinson

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

The QDOT IRAS galaxy redshift is used to construct a smoothed density field, corrected for peculiar velocity distortion, of a region of the local universe out to about 150/h Mpc. The survey is based on a one-in-six random sample of all IRAS galaxies brighter than 0.6 Jy at 60 microns. Predicted peculiar velocities are calculated from this density field, assuming gravitational instability theory, and compared to observed velocities derived from the Tully-Fisher (1987) and Dn - sigma techniques. A good correlation is seen, from which it is estimated that b(IRAS)-Omega exp -0.6 is approximately equal to 1.16 + or - 0.21, which is in general agreement with earlier results from analysis of the Local Group motion. It is inferred that, if IRAS galaxies trace the mass on large scales, the universe has a density very close to the critical value.

Original language	English
Pages (from-to)	1-12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	252
DOIs	https://doi.org/10.1093/mnras/252.1.1
Publication status	Published - 1 Sept 1991

Keywords / Materials (for Non-textual outputs)

Galaxies
Infrared Astronomy Satellite
Spatial Distribution
Velocity Distribution
Computational Astrophysics
Density Distribution
Gravitational Effects
Universe

Access to Document

10.1093/mnras/252.1.1

http://adsabs.harvard.edu/abs/1991MNRAS.252....1K

Cite this

@article{b51abc826e4e460fa783d0cb59929e4f,

title = "The large-scale distribution of IRAS galaxies and the predicted peculiar velocity field",

abstract = "The QDOT IRAS galaxy redshift is used to construct a smoothed density field, corrected for peculiar velocity distortion, of a region of the local universe out to about 150/h Mpc. The survey is based on a one-in-six random sample of all IRAS galaxies brighter than 0.6 Jy at 60 microns. Predicted peculiar velocities are calculated from this density field, assuming gravitational instability theory, and compared to observed velocities derived from the Tully-Fisher (1987) and Dn - sigma techniques. A good correlation is seen, from which it is estimated that b(IRAS)-Omega exp -0.6 is approximately equal to 1.16 + or - 0.21, which is in general agreement with earlier results from analysis of the Local Group motion. It is inferred that, if IRAS galaxies trace the mass on large scales, the universe has a density very close to the critical value.",

keywords = "Galaxies, Infrared Astronomy Satellite, Spatial Distribution, Velocity Distribution, Computational Astrophysics, Density Distribution, Gravitational Effects, Universe",

author = "N. Kaiser and G. Efstathiou and W. Saunders and R. Ellis and C. Frenk and A. Lawrence and M. Rowan-Robinson",

year = "1991",

month = sep,

day = "1",

doi = "10.1093/mnras/252.1.1",

language = "English",

volume = "252",

pages = "1--12",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

}

TY - JOUR

T1 - The large-scale distribution of IRAS galaxies and the predicted peculiar velocity field

AU - Kaiser, N.

AU - Efstathiou, G.

AU - Saunders, W.

AU - Ellis, R.

AU - Frenk, C.

AU - Lawrence, A.

AU - Rowan-Robinson, M.

PY - 1991/9/1

Y1 - 1991/9/1

N2 - The QDOT IRAS galaxy redshift is used to construct a smoothed density field, corrected for peculiar velocity distortion, of a region of the local universe out to about 150/h Mpc. The survey is based on a one-in-six random sample of all IRAS galaxies brighter than 0.6 Jy at 60 microns. Predicted peculiar velocities are calculated from this density field, assuming gravitational instability theory, and compared to observed velocities derived from the Tully-Fisher (1987) and Dn - sigma techniques. A good correlation is seen, from which it is estimated that b(IRAS)-Omega exp -0.6 is approximately equal to 1.16 + or - 0.21, which is in general agreement with earlier results from analysis of the Local Group motion. It is inferred that, if IRAS galaxies trace the mass on large scales, the universe has a density very close to the critical value.

AB - The QDOT IRAS galaxy redshift is used to construct a smoothed density field, corrected for peculiar velocity distortion, of a region of the local universe out to about 150/h Mpc. The survey is based on a one-in-six random sample of all IRAS galaxies brighter than 0.6 Jy at 60 microns. Predicted peculiar velocities are calculated from this density field, assuming gravitational instability theory, and compared to observed velocities derived from the Tully-Fisher (1987) and Dn - sigma techniques. A good correlation is seen, from which it is estimated that b(IRAS)-Omega exp -0.6 is approximately equal to 1.16 + or - 0.21, which is in general agreement with earlier results from analysis of the Local Group motion. It is inferred that, if IRAS galaxies trace the mass on large scales, the universe has a density very close to the critical value.

KW - Galaxies

KW - Infrared Astronomy Satellite

KW - Spatial Distribution

KW - Velocity Distribution

KW - Computational Astrophysics

KW - Density Distribution

KW - Gravitational Effects

KW - Universe

U2 - 10.1093/mnras/252.1.1

DO - 10.1093/mnras/252.1.1

M3 - Article

SN - 0035-8711

VL - 252

SP - 1

EP - 12

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

ER -

The large-scale distribution of IRAS galaxies and the predicted peculiar velocity field

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

Access to Document

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Cite this