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

J. 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, J. Liske, A. R. Lopez-Sanchez, E. N. Taylor

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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 = 0.01 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.

Original languageEnglish
Pages (from-to)3435-3450
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume474
Issue number3
DOIs
Publication statusPublished - 1 Mar 2018

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assembly
galaxies
luminosity
galactic evolution
halos
gravity
sampling
gravitation
trends

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Loveday, J., Christodoulou, L., Norberg, P., Peacock, J. A., Baldry, I. K., Bland-Hawthorn, J., ... Taylor, E. N. (2018). 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), 3435-3450. https://doi.org/10.1093/mnras/stx2971
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. / Galaxy and Mass Assembly (GAMA) : Small-scale anisotropic galaxy clustering and the pairwise velocity dispersion of galaxies. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 474, No. 3. pp. 3435-3450.
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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⊥ = 0.01 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.",
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Loveday, J, Christodoulou, L, Norberg, P, Peacock, JA, Baldry, IK, Bland-Hawthorn, J, Brown, MJI, Colless, M, Driver, SP, Holwerda, BW, Hopkins, AM, Kafle, PR, Liske, J, Lopez-Sanchez, AR & Taylor, EN 2018, 'Galaxy and Mass Assembly (GAMA): Small-scale anisotropic galaxy clustering and the pairwise velocity dispersion of galaxies' Monthly Notices of the Royal Astronomical Society, vol. 474, no. 3, pp. 3435-3450. https://doi.org/10.1093/mnras/stx2971

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.

In: Monthly Notices of the Royal Astronomical Society, Vol. 474, No. 3, 01.03.2018, p. 3435-3450.

Research output: Contribution to journalArticle

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

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U2 - 10.1093/mnras/stx2971

DO - 10.1093/mnras/stx2971

M3 - Article

VL - 474

SP - 3435

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JO - Monthly Notices of the Royal Astronomical Society

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