Hang, Qianjun;
Peacock, John A;
Alam, Shadab;
Cai, Yan-Chuan;
Kraljic, Katarina;
Van Daalen, Marcel;
Bilicki, M;
... Loveday, J; + view all
(2022)
Galaxy and Mass Assembly (GAMA): probing galaxy-group correlations in redshift space with the halo streaming model.
Monthly Notices of the Royal Astronomical Society
, 517
(1)
pp. 374-392.
10.1093/mnras/stac2569.
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Abstract
We have studied the galaxy-group cross-correlations in redshift space for the Galaxy And Mass Assembly (GAMA) Survey. We use a set of mock GAMA galaxy and group catalogues to develop and test a novel ‘halo streaming’ model for redshift-space distortions. This treats 2-halo correlations via the streaming model, plus an empirical 1-halo term derived from the mocks, allowing accurate modelling into the non-linear regime. In order to probe the robustness of the growth rate inferred from redshift-space distortions, we divide galaxies by colour, and divide groups according to their total stellar mass, calibrated to total mass via gravitational lensing. We fit our model to correlation data, to obtain estimates of the perturbation growth rate, fσ8, validating parameter errors via the dispersion between different mock realizations. In both mocks and real data, we demonstrate that the results are closely consistent between different subsets of the group and galaxy populations, considering the use of correlation data down to some minimum projected radius, rmin. For the mock data, we can use the halo streaming model to below $r_{\rm min} = 5{\, h^{-1}\, \rm Mpc}$, finding that all subsets yield growth rates within about 3 per cent of each other, and consistent with the true value. For the actual GAMA data, the results are limited by cosmic variance: fσ8 = 0.29 ± 0.10 at an effective redshift of 0.20; but there is every reason to expect that this method will yield precise constraints from larger data sets of the same type, such as the Dark Energy Spectroscopic Instrument (DESI) bright galaxy survey.
| Type: | Article |
|---|---|
| Title: | Galaxy and Mass Assembly (GAMA): probing galaxy-group correlations in redshift space with the halo streaming model |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stac2569 |
| Publisher version: | https://doi.org/10.1093/mnras/stac2569 |
| 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: | gravitation, galaxies: groups: general, large-scale structure of Universe |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10158412 |
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