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The stellar-to-halo mass relation of GAMA galaxies from 100 deg2 of KiDS weak lensing data

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Date
01/07/2016
Author
Uitert, Edo van
Cacciato, Marcello
Hoekstra, Henk
Brouwer, Margot
Sifón, Cristóbal
Viola, Massimo
Baldry, Ivan
Bland-Hawthorn, Joss
Brough, Sarah
Brown, M. J. I.
Choi, Ami
Driver, Simon P.
Erben, Thomas
Heymans, Catherine
Hildebrandt, Hendrik
Joachimi, Benjamin
Kuijken, Konrad
Liske, Jochen
Loveday, Jon
McFarland, John
Miller, Lance
Nakajima, Reiko
Peacock, John
Radovich, Mario
Robotham, A. S. G.
Schneider, Peter
Sikkema, Gert
Taylor, Edward N.
Kleijn, Gijs Verdoes
Keywords
Gravitational lensing: weak
Methods: observational
Galaxies: groups: general
Galaxies: haloes
Galaxies; luminosity function
Mass function
QB Astronomy
QC Physics
3rd-DAS
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Abstract
We study the stellar-to-halo mass relation of central galaxies in the range 9.7 < log 10(M*/h− 2 M⊙) < 11.7 and z < 0.4, obtained from a combined analysis of the Kilo Degree Survey (KiDS) and the Galaxy And Mass Assembly (GAMA) survey. We use ∼100 deg2 of KiDS data to study the lensing signal around galaxies for which spectroscopic redshifts and stellar masses were determined by GAMA. We show that lensing alone results in poor constraints on the stellar-to-halo mass relation due to a degeneracy between the satellite fraction and the halo mass, which is lifted when we simultaneously fit the stellar mass function. At M* > 5 × 1010 h− 2 M⊙, the stellar mass increases with halo mass as ∼M^0.25_h. The ratio of dark matter to stellar mass has a minimum at a halo mass of 8 × 1011 h−1 M⊙ with a value of Mh/M∗=56^+16_−10[h]. We also use the GAMA group catalogue to select centrals and satellites in groups with five or more members, which trace regions in space where the local matter density is higher than average, and determine for the first time the stellar-to-halo mass relation in these denser environments. We find no significant differences compared to the relation from the full sample, which suggests that the stellar-to-halo mass relation does not vary strongly with local density. Furthermore, we find that the stellar-to-halo mass relation of central galaxies can also be obtained by modelling the lensing signal and stellar mass function of satellite galaxies only, which shows that the assumptions to model the satellite contribution in the halo model do not significantly bias the stellar-to-halo mass relation. Finally, we show that the combination of weak lensing with the stellar mass function can be used to test the purity of group catalogues.
Citation
Uitert , E V , Cacciato , M , Hoekstra , H , Brouwer , M , Sifón , C , Viola , M , Baldry , I , Bland-Hawthorn , J , Brough , S , Brown , M J I , Choi , A , Driver , S P , Erben , T , Heymans , C , Hildebrandt , H , Joachimi , B , Kuijken , K , Liske , J , Loveday , J , McFarland , J , Miller , L , Nakajima , R , Peacock , J , Radovich , M , Robotham , A S G , Schneider , P , Sikkema , G , Taylor , E N & Kleijn , G V 2016 , ' The stellar-to-halo mass relation of GAMA galaxies from 100 deg 2 of KiDS weak lensing data ' , Monthly Notices of the Royal Astronomical Society , vol. 459 , no. 3 , pp. 3251-3270 . https://doi.org/10.1093/mnras/stw747
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stw747
ISSN
0035-8711
Type
Journal article
Rights
© 2016, 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/stw747
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12578

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