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

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Date
21/12/2015
Author
Sifón, Cristóbal
Cacciato, Marcello
Hoekstra, Henk
Brouwer, Margot
Uitert, Edo van
Viola, Massimo
Baldry, Ivan
Brough, Sarah
Brown, Michael J. I.
Choi, Ami
Driver, Simon P.
Erben, Thomas
Grado, Aniello
Heymans, Catherine
Hildebrandt, Hendrik
Joachimi, Benjamin
Jong, Jelte T. A. de
Kuijken, Konrad
McFarland, John
Miller, Lance
Nakajima, Reiko
Napolitano, Nicola
Norberg, Peder
Robotham, Aaron S. G.
Schneider, Peter
Kleijn, Gijs Verdoes
Keywords
Gravitational lensing: weak
Methods: observational
Methods: statistical
Galaxies: haloes
Galaxies: statistics
Dark matter
QB Astronomy
QC Physics
3rd-DAS
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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
DOI
https://doi.org/10.1093/mnras/stv2051
ISSN
0035-8711
Type
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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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12555

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