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

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journal contribution
posted on 2023-06-09, 08:52 authored by Jonathan LovedayJonathan Loveday, L Christodoulou, P Norberg, 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
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 = 0.01h-1 Mpc) than previous work. The measured PVD at projected separations r < 1 h-1 Mpc increases near-monotonically with increasing luminosity from delta12 = 200km s-1 at Mr = -17 mag to delta12 = 600km 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 over-predicts the PVD for faint galaxies. This is most likely a result of the model placing too many low-luminosity galaxies in massive halos.

Funding

Astronomy rolling grant; G0278; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I000976/1

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

3

Volume

474

Page range

3435-3450

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-11-15

First Open Access (FOA) Date

2017-11-15

First Compliant Deposit (FCD) Date

2017-11-15

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