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

M Alpasian, A S G Robotham, Simon P Driver, Peder Norberg, John A Peacock, Ivan K Baldry, Jonathan Bland-Hawthorn, Sarah Brough, Andrew Mark Hopkins, L Kelvin, J Liske, J Loveday, Alexander Merson, Robert C Nichol, Kevin Alan Pimbblet

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    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.
    Original languageEnglish
    Pages (from-to)2832 - 2846
    Number of pages15
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number4
    Publication statusPublished - 2012

    Cite this

    Alpasian, M., Robotham, A. S. G., Driver, S. P., Norberg, P., Peacock, J. A., Baldry, I. K., Bland-Hawthorn, J., Brough, S., Hopkins, A. M., Kelvin, L., Liske, J., Loveday, J., Merson, A., Nichol, R. C., & Pimbblet, K. A. (2012). Galaxy And Mass Assembly (GAMA): estimating galaxy group masses via caustic analysis. Monthly Notices of the Royal Astronomical Society, 426(4), 2832 - 2846.