SIMBAD references

2015MNRAS.452.1171W - Mon. Not. R. Astron. Soc., 452, 1171-1183 (2015/September-2)

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

WILCOX H., BACON D., NICHOL R.C., ROONEY P.J., TERUKINA A., ROMER A.K., KOYAMA K., ZHAO G.-B., HOOD R., MANN R.G., HILTON M., MANOLOPOULOU M., SAHLEN M., COLLINS C.A., LIDDLE A.R., MAYERS J.A., MEHRTENS N., MILLER C.J., STOTT J.P. and VIANA P.T.P.

Abstract (from CDS):

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 (β and φ∞). Our fits are consistent with general relativity, not requiring a fifth force. In the special case of f(R) gravity (where β= sqrt(1/6)), we set an upper limit on the background field amplitude today of {verbar}fR0{verbar} < 6x10–5 (95 percent CL). This is one of the strongest constraints to date on {verbar}fR0{verbar} 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.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): gravitation - gravitational lensing: weak - X-rays: galaxies: clusters

VizieR on-line data: <Available at CDS (J/MNRAS/452/1171): tableb1.dat>

Simbad objects: 119

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2019.12.13-16:29:49

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