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 and Kafle, P R (2017) 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). pp. 3435-3450. ISSN 0035-8711

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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 = 0.01h-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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Depositing User: Billy Wichaidit
Date Deposited: 15 Nov 2017 15:44
Last Modified: 18 Jan 2018 12:57
URI: http://sro.sussex.ac.uk/id/eprint/71284

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Project NameSussex Project NumberFunderFunder Ref
Astronomy rolling grantG0278STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/I000976/1