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The XMM Cluster Survey: Testing chameleon gravity using the profiles of clusters

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  • Harry Wilcox
  • David Bacon
  • Robert C. Nichol
  • Philip J. Rooney
  • Ayumu Terukina
  • A. Kathy Romer
  • Kazuya Koyama
  • Gong-Bo Zhao
  • Ross Hood
  • Robert G. Mann
  • Matt Hilton
  • Maria Manolopoulou
  • Martin Sahlen
  • Chris A. Collins
  • Andrew R. Liddle
  • Julian A. Mayers
  • Nicola Mehrtens
  • Christopher J. Miller
  • John P. Stott
  • Pedro T. P. Viana
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<mark>Journal publication date</mark>14/07/2015
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number2
Volume452
Number of pages13
Pages (from-to)1171-1183
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The chameleon gravity model postulates the existence of a scalar field that couples with matter to mediate a fifth force. If it exists, this fifth force would influence the hot X-ray emitting gas filling the potential wells of galaxy clusters. However, it would not influence the clusters' weak lensing signal. Therefore, by comparing X-ray and weak lensing profiles, one can place upper limits on the strength of a fifth force. This technique has been attempted before using a single, nearby cluster (Coma, $z=0.02$). Here we apply the technique to the stacked profiles of 58 clusters at higher redshifts ($0.1z

Bibliographic note

14 pages, 7 figures