Publications by Lance Miller


Cross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedback

Monthly Notices of the Royal Astronomical Society 471 (2017) 1565-1580

A Hojjati, T Tröster, J Harnois-Déraps, IG McCarthy, L van Waerbeke, A Choi, T Erben, C Heymans, H Hildebrandt, G Hinshaw, YZ Ma, L Miller, M Viola, H Tanimura

© 2017 The Authors. We present measurements of the spatial mapping between (hot) baryons and the total matter in theUniverse, via the cross-correlation between the thermal Sunyaev-Zeldovich (tSZ)map from Planck and the weak gravitational lensing maps from theRed Cluster Sequence Lensing Survey (RCSLenS). The cross-correlations are performed on the map level where all the sources (including diffuse intergalactic gas) contribute to the signal. We consider two configurationspace correlation function estimators, ξ y-κ and ξ y-γt , and a Fourier-space estimator, C ℓy-κ , in our analysis. We detect a significant correlation out to 3° of angular separation on the sky. Based on statistical noise only, we can report 13σ and 17σ detections of the cross-correlation using the configuration-space y-κ and y-γ t estimators, respectively. Including a heuristic estimate of the sampling variance yields a detection significance of 7σ and 8σ, respectively. A similar level of detection is obtained from the Fourier-space estimator, C ℓy-κ . As each estimator probes different dynamical ranges, their combination improves the significance of the detection. We compare our measurements with predictions from the cosmo-OverWhelmingly Large Simulations suite of cosmological hydrodynamical simulations, where different galactic feedback models are implemented.We find that a model with considerable active galactic nuclei (AGN) feedback that removes large quantities of hot gas from galaxy groups and Wilkinson Microwave Anisotropy Probe 7-yr best-fitting cosmological parameters provides the bestmatch to the measurements. All baryonic models in the context of a Planck cosmology overpredict the observed signal. Similar cosmological conclusions are drawn when we employ a halo model with the observed 'universal' pressure profile.


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