The masses of satellites in GAMA galaxy groups from 100 square degrees of KiDS weak lensing data
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Date
21/12/2015Author
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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.
Citation
Sifón , C , Cacciato , M , Hoekstra , H , Brouwer , M , Uitert , E V , 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 , Jong , J T A D , Kuijken , K , McFarland , J , Miller , L , Nakajima , R , Napolitano , N , Norberg , P , Robotham , A S G , Schneider , P & Kleijn , G V 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 , vol. 454 , no. 4 , pp. 3938-3951 . https://doi.org/10.1093/mnras/stv2051
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Rights
© 2015,the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stv2051
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