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

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

Authors

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



Abstract

We have generated complementary halo mass estimates for all the groups in the Galaxy And Mass Assembly Galaxy Group Catalogue (GAMA G 3 Cv1) 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 3 Cv1. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.

Journal Article Type Article
Publication Date Nov 11, 2012
Journal Monthly notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 426
Issue 4
Pages 2832-2846
APA6 Citation Alpaslan, M., Robotham, A. S., Driver, S., Norberg, P., Peacock, J. A., Baldry, I., …Pimbblet, K. (2012). Galaxy And Mass Assembly (GAMA): Estimating galaxy group masses via caustic analysis. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, 426(4), 2832-2846. https://doi.org/10.1111/j.1365-2966.2012.21020.x
DOI https://doi.org/10.1111/j.1365-2966.2012.21020.x
Keywords Galaxies: groups: general; Galaxies: haloes; Dark matter; Large-scale structure of Universe
Publisher URL https://academic.oup.com/mnras/article/426/4/2832/1013164

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