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

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

Research output: Contribution to journalArticlepeer-review


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
Original languageEnglish
Pages (from-to)1171-1183
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Early online date14 Jul 2015
Publication statusPublished - 11 Sep 2015


  • astro-ph.CO


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