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

Sifón, C.; Cacciato, M.; Hoekstra, H.; Brouwer, M.; van Uitert, E.; Viola, M.; Baldry, I.; Brough, S.; Brown, M.J.I.; Choi, A.; Driver, S.P.; Erben, T.; Grado, A.; Heymans, C.; Hildebrandt, H.; Joachimi, B.; de Jong, J.T.A.; Kuijken, K.; McFarland, J.; Miller, L.; Nakajima, R.; Napolitano, N.; Norberg, P.; Robotham, A.S.G.; Schneider, P.; Kleijn, G.V.

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C. Sifón

M. Cacciato

H. Hoekstra

M. Brouwer

E. van Uitert

M. Viola

I. Baldry

S. Brough

M.J.I. Brown

A. Choi

S.P. Driver

T. Erben

A. Grado

C. Heymans

H. Hildebrandt

B. Joachimi

J.T.A. de Jong

K. Kuijken

J. McFarland

L. Miller

R. Nakajima

N. Napolitano

A.S.G. Robotham

P. Schneider

G.V. Kleijn


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.


Sifón, C., Cacciato, M., Hoekstra, H., Brouwer, M., van Uitert, E., Viola, M., …Kleijn, G. (2015). The masses of satellites in GAMA galaxy groups from 100 square degrees of KiDS weak lensing data. Monthly Notices of the Royal Astronomical Society, 454(4), 3938-3951.

Journal Article Type Article
Acceptance Date Aug 30, 2015
Publication Date Dec 21, 2015
Deposit Date Feb 3, 2016
Publicly Available Date Feb 18, 2016
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 454
Issue 4
Pages 3938-3951
Keywords Gravitational lensing: weak, Methods: observational, Methods: statistical, Galaxies: haloes, Galaxies: statistics, Dark matter.


Published Journal Article (990 Kb)

Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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