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Date and Time of the Query: 2019-07-22 T23:53:22 PDT
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For refcode 2015MNRAS.452.1171W:
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Copyright by Royal Astronomical Society. 2015MNRAS.452.1171W The XMM Cluster Survey: testing chameleon gravity using the profiles of clusters Wilcox, Harry; Bacon, David; Nichol, Robert C.; Rooney, Philip J.; Terukina, Ayumu; Romer, A. Kathy; Koyama, Kazuya; Zhao, Gong-Bo; Hood, Ross; Mann, Robert G.; Hilton, Matt; Manolopoulou, Maria; Sahlen, Martin; Collins, Chris A.; Liddle, Andrew R.; Mayers, Julian A.; Mehrtens, Nicola; Miller, Christopher J.; Stott, John P.; Viana, Pedro T. P. 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 (0.1 < 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 phi_{infinity}_). Our fits are consistent with general relativity, not requiring a fifth force. In the special case of f(R) gravity (where beta = sqrt{1/6}), we set an upper limit on the background field amplitude today of |f_R0_| < 6 x 10^-5^ (95 per cent CL). This is one of the strongest constraints to date on |f_R0_| 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. Key words: gravitation, gravitational lensing: weak, X-rays: galaxies: clusters
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