Galaxy cluster lensing masses in modified lensing potentials

Barreira, A.; Li, B.; Jennings, E.; Merten, J.; King, L.; Baugh, C.M.; Pascoli, S.

Abstract

We determine the concentration–mass relation of 19 X-ray selected galaxy clusters from the Cluster Lensing and Supernova Survey with Hubble survey in theories of gravity that directly modify the lensing potential. We model the clusters as Navarro–Frenk–White haloes and fit their lensing signal, in the Cubic Galileon and Nonlocal gravity models, to the lensing convergence profiles of the clusters. We discuss a number of important issues that need to be taken into account, associated with the use of non-parametric and parametric lensing methods, as well as assumptions about the background cosmology. Our results show that the concentration and mass estimates in the modified gravity models are, within the error bars, the same as in Λ cold dark matter. This result demonstrates that, for the Nonlocal model, the modifications to gravity are too weak at the cluster redshifts, and for the Galileon model, the screening mechanism is very efficient inside the cluster radius. However, at distances ∼(2–20) Mpc h−1 from the cluster centre, we find that the surrounding force profiles are enhanced by ∼20–40 per cent in the Cubic Galileon model. This has an impact on dynamical mass estimates, which means that tests of gravity based on comparisons between lensing and dynamical masses can also be applied to the Cubic Galileon model.

Citation

Barreira, A., Li, B., Jennings, E., Merten, J., King, L., Baugh, C., & Pascoli, S. (2015). Galaxy cluster lensing masses in modified lensing potentials. Monthly Notices of the Royal Astronomical Society, 454(4), 4085-4102. https://doi.org/10.1093/mnras/stv2211

• Journal Article Type: Article
• Acceptance Date: Sep 22, 2015
• Publication Date: Dec 21, 2015
• Deposit Date: Aug 17, 2015
• Publicly Available Date: Nov 20, 2015
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 454
• Issue: 4
• Pages: 4085-4102
• DOI: https://doi.org/10.1093/mnras/stv2211
• Keywords: Gravitational lensing: strong, Gravitational lensing: weak, Galaxies: clusters: general, Cosmology: theory.
• Public URL: https://durham-repository.worktribe.com/output/1401224
• Related Public URLs: http://arxiv.org/abs/1505.03468