New approach to galaxy clusters: substructure identification through morphology parameters

Viral Parekh* and Kurt van der Heyden
Astrophysics, Cosmology and Gravity Centre (ACGC), Astronomy Department, University of Cape Town, Private Bag X3, 7700 Rondebosch, Republic of South Africa

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Recent spectral and spatial X-ray observations of galaxy clusters suggest subclustering and merging are common phenomena. Galaxy clusters can therefore be grouped into two categories: relaxed and nonrelaxed. Investigating cluster dynamical states is vital because it is linked with the evolution of galaxy clusters on cosmic time scales. It affects cluster global properties such as the virial temperature, metal distribution, luminosity, and mass calculation. We have investigated the use of a number of morphological parameters (Gini, Asymmetry, M20, Concentration, Ellipticity, Smoothness and Gini 2nd order) to differentiate between relaxed and non-relaxed scenarios. We initially simulated different relaxed and nonrelaxed morphologies with multiple beta profiles. Finally, we applied our method to a different redshift sample of clusters from the Chandra archive and studied correlations between parameters and X-ray gas properties. In this proceding, we will show the promising results from the quantitative study of morphology parameters and its possible application to study the morphology of radio halos and relics clusters.

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Keywords : galaxies: X-ray clusters: substructure - merger: radio halo: radio relic