Dark matter halo properties of GAMA galaxy groups from 100 square degrees of KiDS weak lensing data
| Autor: | Massimo Viola, E. van Uitert, Konrad Kuijken, Henk Hoekstra, Aaron S. G. Robotham, Cristóbal Sifón, Lance Miller, Mehmet Alpaslan, Simon P. Driver, Peter Schneider, Alister W. Graham, Andrew M. Hopkins, Hendrik Hildebrandt, Ami Choi, Benjamin Joachimi, Ivan K. Baldry, Aniello Grado, Thomas Erben, N. Irisarri, Marcello Cacciato, Peder Norberg, Jon Loveday, J. T. A. de Jong, G. A. Verdoes Kleijn, R. Nakajima, Catherine Heymans, Margot M. Brouwer |
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| Přispěvatelé: | Astronomy, University of St Andrews. School of Physics and Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
statistical [Methods]
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Large-scale structure of Universe haloes [Galaxies] Dark matter FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences dark matter Galaxy groups and clusters galaxies: groups: general Galaxy group 0103 physical sciences QB Astronomy observational [Methods] Brightest cluster galaxy 010303 astronomy & astrophysics QC Weak gravitational lensing Galaxy rotation curve Astrophysics::Galaxy Astrophysics QB Physics methods: statistical 010308 nuclear & particles physics Astronomy Astronomy and Astrophysics 3rd-DAS Astrophysics - Astrophysics of Galaxies Galaxy Dark matter halo galaxies: haloes groups: general [Galaxies] QC Physics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) large-scale structure of Universe methods: observational Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 452(4), 3529-3550. Oxford University Press Monthly Notices of the Royal Astronomical Society, 452(4), 3529-3550 Monthly Notices of the Royal Astronomical Society Monthly notices of the Royal Astronomical Society, 2015, Vol.452(4), pp.3529-3550 [Peer Reviewed Journal] |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | The Kilo-Degree Survey (KiDS) is an optical wide-field survey designed to map the matter distribution in the Universe using weak gravitational lensing. In this paper, we use these data to measure the density profiles and masses of a sample of $\sim \mathrm{1400}$ spectroscopically identified galaxy groups and clusters from the Galaxy And Mass Assembly (GAMA) survey. We detect a highly significant signal (signal-to-noise-ratio $\sim$ 120), allowing us to study the properties of dark matter haloes over one and a half order of magnitude in mass, from $M \sim 10^{13}-10^{14.5} h^{-1}\mathrm{M_{\odot}}$. We interpret the results for various subsamples of groups using a halo model framework which accounts for the mis-centring of the Brightest Cluster Galaxy (used as the tracer of the group centre) with respect to the centre of the group's dark matter halo. We find that the density profiles of the haloes are well described by an NFW profile with concentrations that agree with predictions from numerical simulations. In addition, we constrain scaling relations between the mass and a number of observable group properties. We find that the mass scales with the total r-band luminosity as a power-law with slope $1.16 \pm 0.13$ (1-sigma) and with the group velocity dispersion as a power-law with slope $1.89 \pm 0.27$ (1-sigma). Finally, we demonstrate the potential of weak lensing studies of groups to discriminate between models of baryonic feedback at group scales by comparing our results with the predictions from the Cosmo-OverWhelmingly Large Simulations (Cosmo-OWLS) project, ruling out models without AGN feedback. 23 pages, 17 figures, MNRAS accepted, cross-references to other KiDS/GAMA papers fixed in v2; Weak lensing catalogues are available at http://kids.strw.leidenuniv.nl |
| Databáze: | OpenAIRE |
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