Dvornik, A;
Cacciato, M;
Kuijken, K;
Viola, M;
Hoekstra, H;
Nakajima, R;
van Uitert, E;
... Wang, L; + view all
(2017)
A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups.
Monthly Notices of the Royal Astronomical Society
, 468
(3)
pp. 3251-3265.
10.1093/mnras/stx705.
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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 0.85−0.25+0.37, 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.
| Type: | Article |
|---|---|
| Title: | A KiDS weak lensing analysis of assembly bias in GAMA galaxy groups |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx705 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stx705 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | gravitational lensing: weak, methods: statistical, surveys, galaxies: haloes, large-scale structure of Universe |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1550523 |
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