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

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., Hildebrand t, H., Hopkins, A. M., McFarland, J., Norberg, P., Schneider, P., Sifón, C., Valentijn, E. & Wang, L., 1-Jul-2017, In : Monthly Notices of the Royal Astronomical Society. 468, 3, p. 3251-3265 15 p.

Research output: Contribution to journalArticleAcademicpeer-review

  • 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 Hildebrand t
  • Andrew M. Hopkins
  • John McFarland
  • Peder Norberg
  • Peter Schneider
  • Cristóbal Sifón
  • Edwin Valentijn
  • Lingyu Wang
We investigate possible signatures of halo assembly bias for spectroscopically selected galaxy groups from the GAMA survey using weak lensing measurements from the spatially overlapping regions of the deeper, high-imaging-quality photometric KiDS 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 $\Lambda$CDM prediction. Our galaxy groups have typical masses of $10^{13} M_{\odot}/h$, naturally complementing previous studies of halo assembly bias on galaxy cluster scales.
Original languageEnglish
Pages (from-to)3251-3265
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 1-Jul-2017


  • gravitational lensing: weak, methods: statistical, surveys, galaxies: haloes, large-scale structure of Universe, Astrophysics - Cosmology and Nongalactic Astrophysics

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