Measuring the cosmic bulk flow with 6dFGSv

Christina Magoulas*, Christopher Springob, Matthew Colless, Jeremy Mould, John Lucey, Pirin Erdoǧdu, D. Heath Jones

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

While recent years have seen rapid growth in the number of galaxy peculiar velocity measurements, disagreements remain about the extent to which the peculiar velocity field - a tracer of the large-scale distribution of mass - agrees with both ΛCDM expectations and with velocity field models derived from redshift surveys. The 6dF Galaxy Survey includes peculiar velocities for nearly 9 000 early-type galaxies (6dFGSv), making it the largest and most homogeneous galaxy peculiar velocity sample to date. We have used the 6dFGS velocity field to determine the amplitude and scale of large-scale cosmic flows in the local universe and test standard cosmological models. We also compare the galaxy density and peculiar velocity fields to establish the distribution of dark and luminous matter and better constrain key cosmological parameters such as the redshift-space distortion parameter.

Original languageEnglish
Pages (from-to)336-339
Number of pages4
JournalProceedings of the International Astronomical Union
Volume11
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • cosmology: observations - distance scale - large-scale structure of universe
  • galaxies: distances and redshifts

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