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

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posted on 2023-06-09, 01:54 authored by Harry Wilcox, David Bacon, Robert C Nichol, Philip Rooney, Ayumu Terukina, Kathy RomerKathy Romer, Kazuya Koyama, Gong-Bo Zhao, Ross Hood, Robert G Mann, Matt Hilton, Maria Manolopoulou, Martin Sahlén, Chris A Collins, Andrew R Liddle, Julian Mayers, Nicola Mehrtens, Christopher J Miller, John P Stott, Pedro T P Viana
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 (0.1 < z < 1.2), including 12 new to the literature, using X-ray data from the XMM Cluster Survey and weak lensing data from the Canada-France-Hawaii-Telescope Lensing Survey. Using a multiparameter Markov chain Monte Carlo analysis, we constrain the two chameleon gravity parameters (beta and phi8). Our fits are consistent with general relativity, not requiring a fifth force. In the special case of f(R) gravity (where beta = &sur;;{1/6}), we set an upper limit on the background field amplitude today of |fR0| < 6 × 10-5 (95 per cent CL). This is one of the strongest constraints to date on |fR0| on cosmological scales. We hope to improve this constraint in future by extending the study to hundreds of clusters using data from the Dark Energy Survey.

Funding

Astrophysics and Cosmology - Sussex Consolidated Grant; G1291; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/L000652/1

2012 Doctoral Training Grant - Quota Studentships (STFC); G0939; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/K502364/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Wiley-Blackwell

Issue

1

Volume

452

Page range

1171-1183

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-06-27

First Open Access (FOA) Date

2016-06-27

First Compliant Deposit (FCD) Date

2016-06-27

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