Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 474, Issue 3, Pages 3435-3450Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx2971
Keywords
galaxies: kinematics and dynamics; galaxies: statistics
Categories
Funding
- Science and Technology Facilities Council [ST/I000976/1, ST/L00075X/1]
- Royal Society
- European Research Council [DEGAS-259586]
- STFC (UK)
- ARC (Australia)
- AAO
- STFC [ST/I000976/1, ST/H002391/1, ST/J001465/1, ST/L000652/1, ST/P000541/1, ST/F007159/1, ST/M003574/1, PP/E001149/1, ST/L00061X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000652/1, ST/P000541/1, ST/M000966/1, ST/J001465/1, ST/H002391/1, ST/L00061X/1, ST/F007159/1, ST/M003574/1, PP/E001149/1] Funding Source: researchfish
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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(perpendicular to) = 0.01 h(-1) Mpc) than previous work. The measured PVD at projected separations r(perpendicular to) less than or similar to 1 h(-1) Mpc increases near monotonically with increasing luminosity from sigma(12) approximate to 200 km s(-1) at M-r = -17 mag to sigma(12) approximate to 600 km s(-1) at M-r approximate to -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.
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