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

Cristobal Sifon; Marcello Cacciato; Henk Hoekstra; Margot M Brouwer; Edo van Uitert; Massimo Viola; Ivan K Baldry; Sarah Brough; Michael James Isles Brown; Ami Choi; Simon P Driver; Thomas Erben; Aniello Grado; Catherine Heymans; Hendrik Hildebrandt; Benjamin Joachimi; Jelte T A de Jong; Konrad Kuijken; John McFarland; Lance Miller; Reiko Nakajima; Nicola R Napolitano; Peder Norberg; Aaron S G Robotham; Peter Schneider; Gijs Verdoes Kleijn

doi:10.1093/mnras/stv2051

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

Cristobal Sifon, Marcello Cacciato, Henk Hoekstra, Margot M Brouwer, Edo van Uitert, Massimo Viola, Ivan K Baldry, Sarah Brough, Michael James Isles Brown, Ami Choi, Simon P Driver, Thomas Erben, Aniello Grado, Catherine Heymans, Hendrik Hildebrandt, Benjamin Joachimi, Jelte T A de Jong, Konrad Kuijken, John McFarland, Lance MillerReiko Nakajima, Nicola R Napolitano, Peder Norberg, Aaron S G Robotham, Peter Schneider, Gijs Verdoes Kleijn

School of Physics and Astronomy

Research output: Contribution to journal › Article › Research › peer-review

51 Citations (Scopus)

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.

Original language	English
Pages (from-to)	3938-3951
Number of pages	14
Journal	Monthly Notices of the Royal Astronomical Society
Volume	454
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stv2051
Publication status	Published - 2015

Keywords

gravitational lensing: weak
methods: observational
methods: statistical
galaxies: haloes
galaxies: statistics
dark matter

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10.1093/mnras/stv2051

Cite this

Sifon, C., Cacciato, M., Hoekstra, H., Brouwer, M. M., van Uitert, E., Viola, M., Baldry, I. K., 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., ... 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, 454(4), 3938-3951. https://doi.org/10.1093/mnras/stv2051

@article{12e9988f468749e0889b29f82f66edf8,

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

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.",

keywords = "gravitational lensing: weak, methods: observational, methods: statistical, galaxies: haloes, galaxies: statistics, dark matter",

author = "Cristobal Sifon and Marcello Cacciato and Henk Hoekstra and Brouwer, \{Margot M\} and \{van Uitert\}, Edo and Massimo Viola and Baldry, \{Ivan K\} and Sarah Brough and Brown, \{Michael James Isles\} and Ami Choi and Driver, \{Simon P\} and Thomas Erben and Aniello Grado and Catherine Heymans and Hendrik Hildebrandt and Benjamin Joachimi and \{de Jong\}, \{Jelte T A\} and Konrad Kuijken and John McFarland and Lance Miller and Reiko Nakajima and Napolitano, \{Nicola R\} and Peder Norberg and Robotham, \{Aaron S G\} and Peter Schneider and Kleijn, \{Gijs Verdoes\}",

year = "2015",

doi = "10.1093/mnras/stv2051",

language = "English",

volume = "454",

pages = "3938--3951",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

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Sifon, C, Cacciato, M, Hoekstra, H, Brouwer, MM, van Uitert, E, Viola, M, Baldry, IK, Brough, S, Brown, MJI, Choi, A, Driver, SP, Erben, T, Grado, A, Heymans, C, Hildebrandt, H, Joachimi, B, de Jong, JTA, Kuijken, K, McFarland, J, Miller, L, Nakajima, R, Napolitano, NR, Norberg, P, Robotham, ASG, Schneider, P & 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, vol. 454, no. 4, pp. 3938-3951. https://doi.org/10.1093/mnras/stv2051

TY - JOUR

T1 - The masses of satellites in GAMA galaxy groups from 100 square degrees of KiDS weak lensing data

AU - Sifon, Cristobal

AU - Cacciato, Marcello

AU - Hoekstra, Henk

AU - Brouwer, Margot M

AU - van Uitert, Edo

AU - Viola, Massimo

AU - Baldry, Ivan K

AU - Brough, Sarah

AU - Brown, Michael James Isles

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 R

AU - Norberg, Peder

AU - Robotham, Aaron S G

AU - Schneider, Peter

AU - Kleijn, Gijs Verdoes

PY - 2015

Y1 - 2015

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 〈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.

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 〈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.

KW - gravitational lensing: weak

KW - methods: observational

KW - methods: statistical

KW - galaxies: haloes

KW - galaxies: statistics

KW - dark matter

UR - http://mnras.oxfordjournals.org.ezproxy.lib.monash.edu.au/content/454/4/3938.full.pdf+html

UR - https://www.scopus.com/pages/publications/84949257366

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 -

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

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Keywords

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The Growth of Galaxies: Connecting Stars, Gas & Dark Matter

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

Abstract

Keywords

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The Growth of Galaxies: Connecting Stars, Gas & Dark Matter

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