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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Wilcox, H (Autor) Outra; Bacon, D (Autor) Outra; Nichol, RC (Autor) Outra; Rooney, PJ (Autor) Outra; Terukina, A (Autor) Outra; Romer, AK (Autor) Outra; Koyama, K (Autor) Outra; Zhao, GB (Autor) Outra; Hood, R (Autor) Outra; Mann, RG (Autor) Outra; Hilton, M (Autor) Outra; Manolopoulou, M (Autor) Outra; Sahlen, M (Autor) Outra; Collins, CA (Autor) Outra; Liddle, AR (Autor) Outra; Mayers, JA (Autor) Outra; Mehrtens, N (Autor) Outra; Miller, CJ (Autor) Outra; Stott, JP (Autor) Outra; viana, ptp (Autor) FCUP

Revista

Título: Monthly Notices of the Royal Astronomical Society

Vol. 452

Páginas: 1171-1183

ISSN: 0035-8711

Editora: Oxford University Press

Indexação

ISI Web of Knowledge - 74 Citações

Scopus - 74 Citações

Outras Informações

ID Authenticus: P-00G-K1W

DOI: 10.1093/mnras/stv1366

Abstract (EN): 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 = root 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13