Mar 15 – 20, 2020
Europe/Berlin timezone

Statistical Constraints on Gas Clumping in Galaxy Cluster Outskirts with X-ray Angular Power Spectra

Not scheduled




Dr Erwin Lau (University of Miami)


Gas clumping in the outskirts of galaxy clusters is one of the major unexplored astrophysics in cluster formation. We present the first statistical constraint on gas clumping with the combined X-ray angular power spectra measured from the ROSAT All-Sky Survey and the Chandra/XBootes field. The gas clumping factor of group and clusters at < R200m is constrained to be C = 1.7 +1.8/-0.5 at the the 1 sigma level, consistent with previous measurements of clumping in individual clusters. We discuss how to improve constraints on gas clumping and other ICM physics (such as non-thermal pressure and feedback from active galactic nuclei) with ongoing and upcoming X-ray (such as eRASS), microwave, and gravitational lensing observations.

Primary authors

Prof. Nico Cappelluti (University of Miami) Alexander Kolodzig (Institut d'Astrophysique Spatiale (CNRS/ Université Paris Sud)) Dr Erwin Lau (University of Miami) Prof. Daisuke Nagai (Yale University) Dr Masato Shirasaki (NAOJ)

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