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

Sifón, C and Cacciato, M and Hoekstra, H and Brouwer, M and Uitert, EV and Viola, M and Baldry, IK and Brough, S and Brown, MJI and Choi, A and Driver, SP and Erben, T and Grado, A and Heymans, C and Hildebrandt, H and Joachimi, B and Jong, JTAD and Kuijken, K and McFarland, J and Miller, L and Nakajima, R and Napolitano, N and Norberg, P and Robotham, ASG and Schneider, P and Kleijn, GV (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). pp. 3938-3951. ISSN 0035-8711

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Abstract

We use the first 100 sq. deg. of overlap between the Kilo-Degree Survey (KiDS) and the Galaxy And Mass Assembly (GAMA) survey to determine the galaxy halo mass of ~10,000 spectroscopically-confirmed satellite galaxies in massive ($M > 10^{13}h^{-1}{\rm M}_\odot$) 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 (NFW) density profiles, fully accounting for the data covariance. The probed satellite galaxies in these groups have total masses $\log M_{\rm sub} /(h^{-1}{\rm M}_\odot) \approx 11.7 - 12.2$ consistent across group-centric distance within the errorbars. Given their typical stellar masses, $\log M_{\rm \star,sat}/(h^{-2}{\rm M}_\odot) \sim 10.5$, such total masses imply stellar mass fractions of $M_{\rm \star,sat} /M_{\rm sub} \approx 0.04 h^{-1}$ . The average subhalo hosting these satellite galaxies has a mass $M_{\rm sub} \sim 0.015M_{\rm host}$ independent of host halo mass, in broad agreement with the expectations of structure formation in a $\Lambda$CDM universe.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record "The masses of satellites in GAMA galaxy groups from 100 square degrees of KiDS weak lensing data" is available online at: http:dx.doi.org/10.1093/mnras/stv2051
Uncontrolled Keywords: astro-ph.CO; astro-ph.CO; astro-ph.GA
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 15 Sep 2015 10:35
Last Modified: 27 Nov 2015 14:44
URI: http://researchonline.ljmu.ac.uk/id/eprint/2016

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