A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups

Andrej Dvornik; Marcello Cacciato; Konrad Kuijken; Massimo Viola; Henk Hoekstra; Reiko Nakajima; Edo van Uitert; Margot Brouwer; Ami Choi; Thomas Erben; Ian Fenech Conti; Daniel J. Farrow; Ricardo Herbonnet; Catherine Heymans; Hendrik Hildebrandt; Andrew M. Hopkins; John McFarland; Peder Norberg; Peter Schneider; Cristóbal Sifón; Edwin Valentijn; Lingyu Wang

doi:10.1093/mnras/stx705

A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups

Andrej Dvornik, Marcello Cacciato, Konrad Kuijken, Massimo Viola, Henk Hoekstra, Reiko Nakajima, Edo van Uitert, Margot Brouwer, Ami Choi, Thomas Erben, Ian Fenech Conti, Daniel J. Farrow, Ricardo Herbonnet, Catherine Heymans, Hendrik Hildebrandt, Andrew M. Hopkins, John McFarland, Peder Norberg, Peter Schneider, Cristóbal SifónEdwin Valentijn, Lingyu Wang

School of Physics and Astronomy

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

Abstract / Description of output

We investigate possible signatures of halo assembly bias for spectroscopically selected galaxy groups from the Galaxy And Mass Assembly (GAMA) survey using weak lensing measurements from the spatially overlapping regions of the deeper, high-imaging-quality photometric Kilo-Degree Survey. We use GAMA groups with an apparent richness larger than 4 to identify samples with comparable mean host halo masses but with a different radial distribution of satellite galaxies, which is a proxy for the formation time of the haloes. We measure the weak lensing signal for groups with a steeper than average and with a shallower than average satellite distribution and find no sign of halo assembly bias, with the bias ratio of 0.85^{+0.37}_{-0.25}, which is consistent with the Λ cold dark matter prediction. Our galaxy groups have typical masses of 1013 M⊙ h-1, naturally complementing previous studies of halo assembly bias on galaxy cluster scales.

Original language	English
Pages (from-to)	3251-3265
Journal	Monthly Notices of the Royal Astronomical Society
Volume	468
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stx705
Publication status	Published - 22 Mar 2017

Keywords / Materials (for Non-textual outputs)

gravitational lensing: weak
methods: statistical
surveys
galaxies: haloes
large-scale structure of Universe

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10.1093/mnras/stx705

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Dvornik, A., Cacciato, M., Kuijken, K., Viola, M., Hoekstra, H., Nakajima, R., van Uitert, E., Brouwer, M., Choi, A., Erben, T., Fenech Conti, I., Farrow, D. J., Herbonnet, R., Heymans, C., Hildebrandt, H., Hopkins, A. M., McFarland, J., Norberg, P., Schneider, P., ... Wang, L. (2017). A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups. Monthly Notices of the Royal Astronomical Society , 468(3), 3251-3265. https://doi.org/10.1093/mnras/stx705

@article{9278b7738d7c4786b8830535ad872c9a,

title = "A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups",

abstract = "We investigate possible signatures of halo assembly bias for spectroscopically selected galaxy groups from the Galaxy And Mass Assembly (GAMA) survey using weak lensing measurements from the spatially overlapping regions of the deeper, high-imaging-quality photometric Kilo-Degree Survey. We use GAMA groups with an apparent richness larger than 4 to identify samples with comparable mean host halo masses but with a different radial distribution of satellite galaxies, which is a proxy for the formation time of the haloes. We measure the weak lensing signal for groups with a steeper than average and with a shallower than average satellite distribution and find no sign of halo assembly bias, with the bias ratio of 0.85^{+0.37}_{-0.25}, which is consistent with the Λ cold dark matter prediction. Our galaxy groups have typical masses of 1013 M⊙ h-1, naturally complementing previous studies of halo assembly bias on galaxy cluster scales.",

keywords = "gravitational lensing: weak, methods: statistical, surveys, galaxies: haloes, large-scale structure of Universe",

author = "Andrej Dvornik and Marcello Cacciato and Konrad Kuijken and Massimo Viola and Henk Hoekstra and Reiko Nakajima and {van Uitert}, Edo and Margot Brouwer and Ami Choi and Thomas Erben and {Fenech Conti}, Ian and Farrow, {Daniel J.} and Ricardo Herbonnet and Catherine Heymans and Hendrik Hildebrandt and Hopkins, {Andrew M.} and John McFarland and Peder Norberg and Peter Schneider and Crist{\'o}bal Sif{\'o}n and Edwin Valentijn and Lingyu Wang",

year = "2017",

month = mar,

day = "22",

doi = "10.1093/mnras/stx705",

language = "English",

volume = "468",

pages = "3251--3265",

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

issn = "0035-8711",

publisher = "Oxford University Press",

number = "3",

}

Dvornik, A, Cacciato, M, Kuijken, K, Viola, M, Hoekstra, H, Nakajima, R, van Uitert, E, Brouwer, M, Choi, A, Erben, T, Fenech Conti, I, Farrow, DJ, Herbonnet, R, Heymans, C, Hildebrandt, H, Hopkins, AM, McFarland, J, Norberg, P, Schneider, P, Sifón, C, Valentijn, E & Wang, L 2017, 'A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups', Monthly Notices of the Royal Astronomical Society , vol. 468, no. 3, pp. 3251-3265. https://doi.org/10.1093/mnras/stx705

TY - JOUR

T1 - A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups

AU - Dvornik, Andrej

AU - Cacciato, Marcello

AU - Kuijken, Konrad

AU - Viola, Massimo

AU - Hoekstra, Henk

AU - Nakajima, Reiko

AU - van Uitert, Edo

AU - Brouwer, Margot

AU - Choi, Ami

AU - Erben, Thomas

AU - Fenech Conti, Ian

AU - Farrow, Daniel J.

AU - Herbonnet, Ricardo

AU - Heymans, Catherine

AU - Hildebrandt, Hendrik

AU - Hopkins, Andrew M.

AU - McFarland, John

AU - Norberg, Peder

AU - Schneider, Peter

AU - Sifón, Cristóbal

AU - Valentijn, Edwin

AU - Wang, Lingyu

PY - 2017/3/22

Y1 - 2017/3/22

N2 - We investigate possible signatures of halo assembly bias for spectroscopically selected galaxy groups from the Galaxy And Mass Assembly (GAMA) survey using weak lensing measurements from the spatially overlapping regions of the deeper, high-imaging-quality photometric Kilo-Degree Survey. We use GAMA groups with an apparent richness larger than 4 to identify samples with comparable mean host halo masses but with a different radial distribution of satellite galaxies, which is a proxy for the formation time of the haloes. We measure the weak lensing signal for groups with a steeper than average and with a shallower than average satellite distribution and find no sign of halo assembly bias, with the bias ratio of 0.85^{+0.37}_{-0.25}, which is consistent with the Λ cold dark matter prediction. Our galaxy groups have typical masses of 1013 M⊙ h-1, naturally complementing previous studies of halo assembly bias on galaxy cluster scales.

AB - We investigate possible signatures of halo assembly bias for spectroscopically selected galaxy groups from the Galaxy And Mass Assembly (GAMA) survey using weak lensing measurements from the spatially overlapping regions of the deeper, high-imaging-quality photometric Kilo-Degree Survey. We use GAMA groups with an apparent richness larger than 4 to identify samples with comparable mean host halo masses but with a different radial distribution of satellite galaxies, which is a proxy for the formation time of the haloes. We measure the weak lensing signal for groups with a steeper than average and with a shallower than average satellite distribution and find no sign of halo assembly bias, with the bias ratio of 0.85^{+0.37}_{-0.25}, which is consistent with the Λ cold dark matter prediction. Our galaxy groups have typical masses of 1013 M⊙ h-1, naturally complementing previous studies of halo assembly bias on galaxy cluster scales.

KW - gravitational lensing: weak

KW - methods: statistical

KW - surveys

KW - galaxies: haloes

KW - large-scale structure of Universe

U2 - 10.1093/mnras/stx705

DO - 10.1093/mnras/stx705

M3 - Article

SN - 0035-8711

VL - 468

SP - 3251

EP - 3265

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups

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Keywords / Materials (for Non-textual outputs)

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