Galaxy And Mass Assembly (GAMA): Estimating galaxy group masses via caustic analysis

Mehmet Alpaslan*, Aaron S G Robotham, Simon Driver, Peder Norberg, John A. Peacock, Ivan Baldry, Joss Bland-Hawthorn, Sarah Brough, Andrew M. Hopkins, Lee S. Kelvin, Jochen Liske, Jon Loveday, Alexander Merson, Robert C. Nichol, Kevin Pimbblet

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We have generated complementary halo mass estimates for all the groups in the Galaxy And Mass Assembly Galaxy Group Catalogue (GAMA G 3Cv1) using a modified caustic mass estimation algorithm, originally developed by Diaferio & Geller. We calibrate the algorithm by applying it on a series of nine GAMA mock galaxy light cones and investigate the effects of using different definitions for group centre and size. We select the set of parameters that provide median-unbiased mass estimates when tested on mocks, and generate mass estimates for the real group catalogue. We find that on average, the caustic mass estimates agree with dynamical mass estimates within a factor of 2 in 90.8 ± 6.1 per cent groups and compare equally well to velocity dispersion based mass estimates for both high- and low-multiplicity groups over the full range of masses probed by the G 3Cv1.

Original languageEnglish
Pages (from-to)2832-2846
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume426
Issue number4
DOIs
Publication statusPublished - 11 Nov 2012
Externally publishedYes

Keywords

  • Dark matter
  • Galaxies: groups: general
  • Galaxies: haloes
  • Large-scale structure of Universe

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