The masses of satellites in GAMA galaxy groups from 100 square degrees of KiDS weak lensing data

Cristobal Sifon, Marcello Cacciato, Henk Hoekstra, Margot M Brouwer, Edo van Uitert, Massimo Viola, Ivan K Baldry, Sarah Brough, Michael James Isles Brown, Ami Choi, Simon P Driver, Thomas Erben, Aniello Grado, Catherine Heymans, Hendrik Hildebrandt, Benjamin Joachimi, Jelte T A de Jong, Konrad Kuijken, John McFarland, Lance MillerReiko Nakajima, Nicola R Napolitano, Peder Norberg, Aaron S G Robotham, Peter Schneider, Gijs Verdoes Kleijn

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38 Citations (Scopus)

Abstract

We use the first 100 deg2 of overlap between the Kilo-Degree Survey and the Galaxy And Mass Assembly survey to determine the average galaxy halo mass of ∼10 000 spectroscopically confirmed satellite galaxies in massive (M > 1013 h−1 M⊙) galaxy groups. Separating the sample as a function of projected distance to the group centre, we jointly model the satellites and their host groups with Navarro–Frenk–White density profiles, fully accounting for the data covariance. The probed satellite galaxies in these groups have total masses log 〈Msub/(h−1 M⊙)〉 ≈ 11.7–12.2 consistent across group-centric distance within the errorbars. Given their typical stellar masses, log 〈M⋆, sat/(h−2 M⊙)〉 ∼ 10.5, such total masses imply stellar mass fractions of 〈M⋆, sat〉/〈Msub〉 ≈ 0.04 h−1. The average subhalo hosting these satellite galaxies has a mass Msub ∼ 0.015Mhost independent of host halo mass, in broad agreement with the expectations of structure formation in a Λ cold dark matter universe.
Original languageEnglish
Pages (from-to)3938-3951
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume454
Issue number4
DOIs
Publication statusPublished - 2015

Keywords

  • gravitational lensing: weak
  • methods: observational
  • methods: statistical
  • galaxies: haloes
  • galaxies: statistics
  • dark matter

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