Thursday 14 Sep 2017The X-ray properties of galaxy clusters

Dr. Paul Giles - University of Bristol

Physics, 4th Floor 14:00-15:00

Galaxy clusters are the largest gravitationally bound structures in the Universe, and can be used to place robust constraints on cosmology. However, many cluster samples used to investigate scaling relations in order constrain the cluster mass, a critical component for using clusters as cosmological probes, suffer from selection effects that can have a dramatic effect on the observed relations. In the first part of the talk, I will present work investigating the X-ray luminosity-mass relation of a sample of 35 galaxy clusters, taking fully into account the selection effects. While the correction of scaling relations for selection effects is of paramount importance, another way to probe the selection of clusters is to select a sample of clusters via other multi-wavelength observations. Recent results have shown that selecting clusters at optical wavelengths reveal a wider cluster population than that probed in the X-ray (Andreon et al., 2016). We build on this work using clusters detected from the GAMA (optical) and XXL (X-ray) surveys, comparing the luminosity-mass relation for these clusters.

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