Journal article

The 6dF Galaxy Survey: peculiar velocity field and cosmography

Christopher M Springob, Christina Magoulas, Matthew Colless, Jeremy Mould, Pirin Erdogdu, D Heath Jones, John R Lucey, Lachlan Campbell, Christopher J Fluke

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2014

Abstract

We derive peculiar velocities for the 6dF Galaxy Survey (6dFGS) and describe the velocity field of the nearby (z < 0.055) Southern hemisphere. The survey comprises 8885 galaxies for which we have previously reported Fundamental Plane data. We obtain peculiar velocity probability distributions for the redshift-space positions of each of these galaxies using a Bayesian approach. Accounting for selection bias, we find that the logarithmic distance uncertainty is 0.11 dex, corresponding to 26 per cent in linear distance. We use adaptive kernel smoothing to map the observed 6dFGS velocity field out to cz ~ 16000 km s-1, and compare this to the predicted velocity fields from the PSCz Survey and th..

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University of Melbourne Researchers

Grants

Awarded by Australian Research Council


Awarded by U.K. Science and Technology Facility Council (STFC)


Awarded by Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)


Awarded by Science and Technology Facilities Council


Funding Acknowledgements

We acknowledge the efforts of the staff of the Australian Astronomical Observatory (AAO), who have undertaken the survey observations and developed the 6dF instrument. We thank Alex Merson for providing the 6dFGS group catalogue, Enzo Branchini for providing a copy of the PSCz reconstruction, and Chris Blake and Yin-Zhe Ma for useful comments and discussion. Three-dimensional visualization was conducted with the S2PLOT programming library (Barnes et al. 2006). D.H.J. acknowledges support from the Australian Research Council Discover-Projects Grant (DP-0208876), administered by the Australian National University. J.R.M. acknowledges support from the Australian Research Council Discovery-Projects Grant (DP-1092666). C.M. has been supported by a scholarship from the AAO. J.R.L. acknowledges support from the U.K. Science and Technology Facility Council (STFC, ST/I001573/I). This research was conducted by the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020.