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Galaxy and Mass Assembly (GAMA): galaxy pairwise velocity dispersion

Published online by Cambridge University Press:  12 October 2016

Jon Loveday ,
Leonidas Christodoulou  and
the GAMA team
Jon Loveday
Affiliation:
Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH, UK email: [email protected]
Leonidas Christodoulou
Affiliation:
Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH, UK email: [email protected]
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Abstract

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We describe preliminary measurements of the pairwise velocity dispersion (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 measure the PVD to smaller scales and for lower-luminosity galaxies than previous SDSS-based work. We see no strong scale-dependence at most luminosities in the quasi-linear regime. We observe an apparent drop in PVD towards very small scales (below ≈ 0.1h−1 Mpc), but this could in part be due to a restriction of the streaming model employed. At intermediate scales, the PVD is highest (~ 500 km/s) at intermediate luminosities, dropping at both fainter and brighter luminosities.

Keywords

galaxies: kinematics and dynamicsgalaxies: statistics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 328 - 331
Copyright
Copyright © International Astronomical Union 2016 

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