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.
Original · EN
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 Mpc/h) than previous work. The measured PVD at projected separations r < 1 Mpc/h increases near-monotonically with increasing luminosity from σ≈ 200 km/s at Mᵣ = -17 mag to σ≈ 600 km/s at Mᵣ ≈ -22 mag. Analysis of the Gonzalez-Perez (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.
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