2-6 September 2019
Europe/Zurich timezone

Tomographic measurement of the cosmic gas pressure through galaxy-tSZ cross-correlations

5 Sep 2019, 17:55
Talk CMB, Universe Expansion, and Thermal History Parallel Sessions: CMB, Expansion Rate, Thermal History (C.A.R.L., H09)


Mr Nick Koukoufilippas (University of Oxford)


Understanding the thermal properties of the cosmic gas is vital in order to mitigate important astrophysical systematics for cosmology. The relation between mass and gas pressure is a particularly relevant one, which affects both Sunyaev-Zel'dovich (SZ) cluster studies and weak lensing analyses. In this work, we use the SZ effect, quantified through the Planck Compton-y maps, and galaxy number counts from a set of low-redshift photometric surveys to make a tomographic measurement of the cosmic gas pressure at low redshifts. We compare our results with the constraints found by Planck based on cluster counts, as well as other existing analyses using alternative datasets.

Primary author

Mr Nick Koukoufilippas (University of Oxford)


David Alonso

Presentation Materials