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.

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., 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. https://doi.org/10.1093/mnras/stv2051

• 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
• DOI: https://doi.org/10.1093/mnras/stv2051
• Keywords: Gravitational lensing: weak, Methods: observational, Methods: statistical, Galaxies: haloes, Galaxies: statistics, Dark matter.
• Public URL: https://durham-repository.worktribe.com/output/1413327