Galaxy and Mass Assembly (GAMA): small-scale anisotropic galaxy clustering and the pairwise velocity dispersion of galaxies

Loveday, J.; Christodoulou, L.; Norberg, P.; Peacock, J.A.; Baldry, I.K.; Bland-Hawthorn, J.; Brown, M.J.I.; Colless, M.; Driver, S.P.; Holwerda, B.W.; Hopkins, A.M.; Kafle, P.R.; Liske, J.; Lopez-Sanchez, A.R.; Taylor, E.N.

doi:10.1093/mnras/stx2971

Galaxy and Mass Assembly (GAMA): small-scale anisotropic galaxy clustering and the pairwise velocity dispersion of galaxies

Loveday, J.; Christodoulou, L.; Norberg, P.; Peacock, J.A.; Baldry, I.K.; Bland-Hawthorn, J.; Brown, M.J.I.; Colless, M.; Driver, S.P.; Holwerda, B.W.; Hopkins, A.M.; Kafle, P.R.; Liske, J.; Lopez-Sanchez, A.R.; Taylor, E.N.

Authors

J. Loveday

L. Christodoulou

Professor Peder Norberg peder.norberg@durham.ac.uk
Professor

J.A. Peacock

I.K. Baldry

J. Bland-Hawthorn

M.J.I. Brown

M. Colless

S.P. Driver

B.W. Holwerda

A.M. Hopkins

P.R. Kafle

J. Liske

A.R. Lopez-Sanchez

E.N. Taylor

Abstract

The galaxy pairwise velocity dispersion (PVD) can provide important tests of non-standard gravity and galaxy formation models. We describe measurements of the PVD of galaxies in the Galaxy and Mass Assembly (GAMA) survey as a function of projected separation and galaxy luminosity. Due to the faint magnitude limit (r < 19.8) and highly complete spectroscopic sampling of the GAMA survey, we are able to reliably measure the PVD to smaller scales (r⊥ = 0.01 h − 1 Mpc) than previous work. The measured PVD at projected separations r⊥ ≲ 1 h − 1 Mpc increases near monotonically with increasing luminosity from σ12 ≈ 200 km s − 1 at Mr = −17 mag to σ12 ≈ 600 km s − 1 at Mr ≈ −22 mag. Analysis of the Gonzalez-Perez et al. (2014) GALFORM semi-analytic model yields no such trend of PVD with luminosity: the model overpredicts the PVD for faint galaxies. This is most likely a result of the model placing too many low-luminosity galaxies in massive haloes.

Citation

Loveday, J., Christodoulou, L., Norberg, P., Peacock, J., Baldry, I., Bland-Hawthorn, J., …Taylor, E. (2018). Galaxy and Mass Assembly (GAMA): small-scale anisotropic galaxy clustering and the pairwise velocity dispersion of galaxies. Monthly Notices of the Royal Astronomical Society, 474(3), 3435-3450. https://doi.org/10.1093/mnras/stx2971

Journal Article Type	Article
Acceptance Date	Nov 13, 2017
Online Publication Date	Nov 17, 2017
Publication Date	Mar 1, 2018
Deposit Date	Jan 15, 2018
Publicly Available Date	Jan 16, 2018
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	474
Issue	3
Pages	3435-3450
DOI	https://doi.org/10.1093/mnras/stx2971

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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017. The Authors.
Published by Oxford University Press on behalf of the Royal Astronomical Society.