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A slight excess of large-scale power from moments of the peculiar velocity field

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A slight excess of large-scale power from moments of the peculiar velocity field. / Macaulay, E.; Feldman, H.; Ferreira, P. G.; Hudson, M. J.; Watkins, R.

In: Monthly Notices of the Royal Astronomical Society, Vol. 414, No. 1, 01.06.2011, p. 621-626.

Research output: Contribution to journalArticlepeer-review

Harvard

Macaulay, E, Feldman, H, Ferreira, PG, Hudson, MJ & Watkins, R 2011, 'A slight excess of large-scale power from moments of the peculiar velocity field', Monthly Notices of the Royal Astronomical Society, vol. 414, no. 1, pp. 621-626. https://doi.org/10.1111/j.1365-2966.2011.18426.x

APA

Macaulay, E., Feldman, H., Ferreira, P. G., Hudson, M. J., & Watkins, R. (2011). A slight excess of large-scale power from moments of the peculiar velocity field. Monthly Notices of the Royal Astronomical Society, 414(1), 621-626. https://doi.org/10.1111/j.1365-2966.2011.18426.x

Vancouver

Macaulay E, Feldman H, Ferreira PG, Hudson MJ, Watkins R. A slight excess of large-scale power from moments of the peculiar velocity field. Monthly Notices of the Royal Astronomical Society. 2011 Jun 1;414(1):621-626. https://doi.org/10.1111/j.1365-2966.2011.18426.x

Author

Macaulay, E. ; Feldman, H. ; Ferreira, P. G. ; Hudson, M. J. ; Watkins, R. / A slight excess of large-scale power from moments of the peculiar velocity field. In: Monthly Notices of the Royal Astronomical Society. 2011 ; Vol. 414, No. 1. pp. 621-626.

Bibtex

@article{779ded0af2034c74af15a4ec7f2a9c65,
title = "A slight excess of large-scale power from moments of the peculiar velocity field",
abstract = "The peculiar motions of galaxies can be used to infer the distribution of matter in the Universe. It has recently been shown that measurements of the peculiar velocity field indicate an anomalously high bulk flow of galaxies in our local volume. In this paper, we find the implications of the high bulk flow for the power spectrum of density fluctuations. We find that analysing only the dipole moment of the velocity field yields an average power spectrum amplitude which is indeed much higher than the Λ cold dark matter (ΛCDM) value. However, by also including shear and octupole moments of the velocity field, and marginalizing over possible values for the growth rate, an average power spectrum amplitude which is consistent with the ΛCDM is recovered. We attempt to infer the shape of the matter power spectrum from moments of the velocity field, and find a slight excess of power on scales ~1h-1 Gpc.",
keywords = "Cosmology: observations, Cosmology: theory, Galaxies: kinematics and dynamics, Galaxies: statistics, Large-scale structure of Universe",
author = "E. Macaulay and H. Feldman and Ferreira, {P. G.} and Hudson, {M. J.} and R. Watkins",
year = "2011",
month = jun,
day = "1",
doi = "10.1111/j.1365-2966.2011.18426.x",
language = "English",
volume = "414",
pages = "621--626",
journal = "MNRAS",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

RIS

TY - JOUR

T1 - A slight excess of large-scale power from moments of the peculiar velocity field

AU - Macaulay, E.

AU - Feldman, H.

AU - Ferreira, P. G.

AU - Hudson, M. J.

AU - Watkins, R.

PY - 2011/6/1

Y1 - 2011/6/1

N2 - The peculiar motions of galaxies can be used to infer the distribution of matter in the Universe. It has recently been shown that measurements of the peculiar velocity field indicate an anomalously high bulk flow of galaxies in our local volume. In this paper, we find the implications of the high bulk flow for the power spectrum of density fluctuations. We find that analysing only the dipole moment of the velocity field yields an average power spectrum amplitude which is indeed much higher than the Λ cold dark matter (ΛCDM) value. However, by also including shear and octupole moments of the velocity field, and marginalizing over possible values for the growth rate, an average power spectrum amplitude which is consistent with the ΛCDM is recovered. We attempt to infer the shape of the matter power spectrum from moments of the velocity field, and find a slight excess of power on scales ~1h-1 Gpc.

AB - The peculiar motions of galaxies can be used to infer the distribution of matter in the Universe. It has recently been shown that measurements of the peculiar velocity field indicate an anomalously high bulk flow of galaxies in our local volume. In this paper, we find the implications of the high bulk flow for the power spectrum of density fluctuations. We find that analysing only the dipole moment of the velocity field yields an average power spectrum amplitude which is indeed much higher than the Λ cold dark matter (ΛCDM) value. However, by also including shear and octupole moments of the velocity field, and marginalizing over possible values for the growth rate, an average power spectrum amplitude which is consistent with the ΛCDM is recovered. We attempt to infer the shape of the matter power spectrum from moments of the velocity field, and find a slight excess of power on scales ~1h-1 Gpc.

KW - Cosmology: observations

KW - Cosmology: theory

KW - Galaxies: kinematics and dynamics

KW - Galaxies: statistics

KW - Large-scale structure of Universe

UR - http://www.scopus.com/inward/record.url?scp=79957897835&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2011.18426.x

DO - 10.1111/j.1365-2966.2011.18426.x

M3 - Article

AN - SCOPUS:79957897835

VL - 414

SP - 621

EP - 626

JO - MNRAS

JF - MNRAS

SN - 0035-8711

IS - 1

ER -

ID: 11032381