Self-consistent secondary cosmic microwave background anisotropies and extragalactic foregrounds in the flamingo simulations

Monthly Notices of the Royal Astronomical Society, vol. 548

Abstract

ABSTRACT Secondary anisotropies in the cosmic microwave background (CMB) contain information that can be used to test both cosmological models and models of galaxy formation. Starting from light-cone-based healpix maps and catalogues, we present a new set of mock CMB maps constructed in a self-consistent manner from the flamingo suite of cosmological hydrodynamical simulations, including CMB lensing, thermal and kinetic Sunyaev–Zel’dovich effects, cosmic infrared background, radio point source and anisotropic screening maps. We show that these simulations reproduce a wide range of observational constraints. We also compare our simulations with previous predictions based on dark matter-only simulations which generally model the secondary anisotropies independently from one another, concluding that our hydrodynamical simulation mocks perform at least as well as previous mocks in matching the observations whilst retaining self-consistency in the predictions of the different components. Using the model variations in flamingo, we further explore how the signals depend on cosmology and feedback modelling, and we predict cross-correlations between some of the signals that differ significantly from those in previous mocks. The mock CMB maps should provide a valuable resource for exploring correlations between different secondary anisotropies and other large-scale structure tracers, and can be applied to forecasts for upcoming surveys.

Authors 8

1. Tianyi Yang corresponding

   Liverpool John Moores University

   Affiliation as printed

   Astrophysics Research Institute, Liverpool John Moores University , Liverpool L3 5RF ,

2. Ian G. McCarthy corresponding

   Liverpool John Moores University

   Affiliation as printed

   Astrophysics Research Institute, Liverpool John Moores University , Liverpool L3 5RF ,

3. Boris Bolliet

   University of Cambridge

   Affiliation as printed

   Cavendish Astrophysics, University of Cambridge , Madingley Road, Cambridge CB3 0HA ,

   Kavli Institute for Cosmology Cambridge, University of Cambridge , Madingley Road, Cambridge CB3 0HA ,

4. Jens Chluba

   University of Manchester

   Affiliation as printed

   Jodrell Bank Centre for Astrophysics, Alan Turing Building, University of Manchester , Manchester M13 9PL ,

5. William R. Coulton

   University of Cambridge

   Affiliation as printed

   DAMTP, Centre for Mathematical Sciences, University of Cambridge , Wilberforce Road, Cambridge CB3 OWA ,

   Kavli Institute for Cosmology Cambridge, University of Cambridge , Madingley Road, Cambridge CB3 0HA ,

6. John C Helly

   Durham University

   Affiliation as printed

   Durham University Institute for Computational Cosmology, Department of Physics, , South Road, Durham DH1 3LE ,

7. Matthieu Schaller Aachen Leiden Observatory Lorentz Institute for Theoretical Physics

   Leiden University · Leiden Observatory

   Affiliation as printed

   Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden ,

   Lorentz Institute for Theoretical Physics, Leiden University , PO box 9506, NL-2300 RA Leiden ,

8. Joop Schaye Aachen Leiden Observatory

   Leiden University · Leiden Observatory

   Affiliation as printed

   Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden ,