Velliscig, M;
Cacciato, M;
Hoekstra, H;
Schaye, J;
Heymans, C;
Hildebrandt, H;
Loveday, J;
... Kuijken, K; + view all
(2017)
Galaxy-galaxy lensing in EAGLE: comparison with data from 180 deg(2) of the KiDS and GAMA surveys.
Monthly Notices of the Royal Astronomical Society
, 471
(3)
pp. 2856-2870.
10.1093/mnras/stx1789.
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Abstract
We present predictions for the galaxy–galaxy lensing (GGL) profile from the EAGLE hydrodynamical cosmological simulation at redshift z = 0.18, in the spatial range 0.02 < R/(h− 1 Mpc) < 2, and for five logarithmically equispaced stellar mass bins in the range 10.3 < log10(Mstar/ M⊙) < 11.8. We compare these excess surface density profiles to the observed signal from background galaxies imaged by the Kilo Degree Survey around spectroscopically confirmed foreground galaxies from the Galaxy And Mass Assembly (GAMA) survey. Exploiting the GAMA galaxy group catalogue, the profiles of central and satellite galaxies are computed separately for groups with at least five members to minimize contamination. EAGLE predictions are in broad agreement with the observed profiles for both central and satellite galaxies, although the signal is underestimated at R ≈ 0.5–2 h− 1 Mpc for the highest stellar mass bins. When central and satellite galaxies are considered simultaneously, agreement is found only when the selection function of lens galaxies is taken into account in detail. Specifically, in the case of GAMA galaxies, it is crucial to account for the variation of the fraction of satellite galaxies in bins of stellar mass induced by the flux-limited nature of the survey. We report the inferred stellar-to-halo mass relation and we find good agreement with recent published results. We note how the precision of the GGL profiles in the simulation holds the potential to constrain fine-grained aspects of the galaxy-dark matter connection.
| Type: | Article |
|---|---|
| Title: | Galaxy-galaxy lensing in EAGLE: comparison with data from 180 deg(2) of the KiDS and GAMA surveys |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx1789 |
| Publisher version: | http://doi.org/10.1093/mnras/stx1789 |
| Language: | English |
| Additional information: | © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, gravitational lensing: weak, methods: statistical, galaxies: formation, galaxies: haloes, large-scale structure of Universe, cosmology: theory, DARK-MATTER HALOES, MASS ASSEMBLY GAMA, STELLAR POPULATION SYNTHESIS, LARGE-SCALE STRUCTURE, DIGITAL SKY SURVEY, 100 SQUARE DEGREES, STAR-FORMATION, SHAPE MEASUREMENT, DENSITY PROFILE, SIMULATIONS |
| 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-pp.ucl.ac.uk/id/eprint/1550519 |
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