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Multi-wavelength scaling relations in galaxy groups: a detailed comparison of GAMA and KiDS observations to BAHAMAS simulations

Jakobs, A, Viola, M, McCarthy, IG, Waerbeke, LV, Hoekstra, H, Robotham, A, Hinshaw, G, Hojjati, A, Tanimura, H, Tröster, T, Baldry, IK, Heymans, C, Hildebrandt, H, Kuijken, K, Norberg, P, Schaye, J, Sifon, C, Uitert, EV, Valentijn, E, Kleijn, GV and Wang, L (2018) Multi-wavelength scaling relations in galaxy groups: a detailed comparison of GAMA and KiDS observations to BAHAMAS simulations. Monthly Notices of the Royal Astronomical Society, 480 (3). pp. 3338-3355. ISSN 0035-8711

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Abstract

We study the scaling relations between the baryonic content and total mass of groups of galaxies, as these systems provide a unique way to examine the role of non-gravitational processes in structure formation. Using Planck and ROSAT data, we conduct detailed comparisons of the stacked thermal Sunyaev-Zel'dovich (tSZ) effect and X-ray scaling relations of galaxy groups found in the the Galaxy And Mass Assembly (GAMA) survey and the BAHAMAS hydrodynamical simulation. We use weak gravitational lensing data from the Kilo Degree Survey (KiDS) to determine the average halo mass of the studied systems. We analyse the simulation in the same way, using realistic weak lensing, X-ray, and tSZ synthetic observations. Furthermore, to keep selection biases under control, we employ exactly the same galaxy selection and group identification procedures to the observations and simulation. Applying this careful comparison, we find that the simulations are in agreement with the observations, particularly with regards to the scaling relations of the lensing and tSZ results. This finding demonstrates that hydrodynamical simulation have reached the level of realism that is required to interpret observational survey data and study the baryon physics within dark matter haloes, where analytical modelling is challenging. Finally, using simulated data, we demonstrate that our observational processing of the X-ray and tSZ signals is free of significant biases. We find that our optical group selection procedure has, however, some room for improvement.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.CO; astro-ph.CO; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 15 Oct 2018 09:40
Last Modified: 15 Oct 2018 09:45
DOI or Identification number: 10.1093/mnras/sty2017
URI: http://researchonline.ljmu.ac.uk/id/eprint/9483

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