TY - JOUR
T1 - Galaxy and Mass Assembly (GAMA)
T2 - Small-scale anisotropic galaxy clustering and the pairwise velocity dispersion of galaxies
AU - Loveday, J.
AU - Christodoulou, L.
AU - Norberg, P.
AU - Peacock, J. A.
AU - Baldry, I. K.
AU - Bland-Hawthorn, J.
AU - Brown, M. J.I.
AU - Colless, M.
AU - Driver, S. P.
AU - Holwerda, B. W.
AU - Hopkins, A. M.
AU - Kafle, P. R.
AU - Liske, J.
AU - Lopez-Sanchez, A. R.
AU - Taylor, E. N.
PY - 2018/3/1
Y1 - 2018/3/1
N2 - 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.
AB - 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.
KW - Galaxies: kinematics and dynamics
KW - Galaxies: statistics
UR - http://www.scopus.com/inward/record.url?scp=85040222691&partnerID=8YFLogxK
U2 - 10.1093/mnras/stx2971
DO - 10.1093/mnras/stx2971
M3 - Article
AN - SCOPUS:85040222691
SN - 0035-8711
VL - 474
SP - 3435
EP - 3450
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -