TY - JOUR
T1 - The masses of satellites in GAMA galaxy groups from 100 square degrees of KiDS weak lensing data
AU - Sifón, Cristóbal
AU - Cacciato, Marcello
AU - Hoekstra, Henk
AU - Brouwer, Margot
AU - van Uitert, Edo
AU - Viola, Massimo
AU - Baldry, Ivan
AU - Brough, Sarah
AU - Brown, Michael J. I.
AU - Choi, Ami
AU - Driver, Simon P.
AU - Erben, Thomas
AU - Grado, Aniello
AU - Heymans, Catherine
AU - Hildebrandt, Hendrik
AU - Joachimi, Benjamin
AU - de Jong, Jelte T. A.
AU - Kuijken, Konrad
AU - McFarland, John
AU - Miller, Lance
AU - Nakajima, Reiko
AU - Napolitano, Nicola
AU - Norberg, Peder
AU - Robotham, Aaron S. G.
AU - Schneider, Peter
AU - Kleijn, Gijs Verdoes
PY - 2015/12/1
Y1 - 2015/12/1
N2 - 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 ≈ 11.7-12.2 consistent across group-centric
distance within the errorbars. Given their typical stellar masses, log
˜ 10.5, such total masses imply stellar mass fractions of
/ ≈ 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.
AB - 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 ≈ 11.7-12.2 consistent across group-centric
distance within the errorbars. Given their typical stellar masses, log
˜ 10.5, such total masses imply stellar mass fractions of
/ ≈ 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.
KW - gravitational lensing: weak
KW - methods: observational
KW - methods: statistical
KW - galaxies: haloes
KW - galaxies: statistics
KW - dark matter
U2 - 10.1093/mnras/stv2051
DO - 10.1093/mnras/stv2051
M3 - Article
SN - 0035-8711
VL - 454
SP - 3938
EP - 3951
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -