EPJ Web of Conferences (Jan 2024)

A semi-parametric approach to fitting gas pressure profiles of galaxy clusters

  • Wang K.,
  • Perrott Y.,
  • Arnold R.,
  • Huijser D.

DOI
https://doi.org/10.1051/epjconf/202429300051
Journal volume & issue
Vol. 293
p. 00051

Abstract

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This study focuses on modelling galaxy cluster gas profiles via a semi-parametric nodal approach. While traditional methods like the generalised Navarro–Frenk–White (gNFW) often encounter parameter degeneracy, our flexible node-based method precisely defines a cluster gas pressure profile. Using Planck space telescope data from the Coma region, our model, focused on the pressure-radius relationship, showcases enhanced flexibility over the gNFW. Bayesian analyses indicated an optimal five-node structure for the Coma cluster pressure profile.