CLASH-VLT

Testing the nature of gravity with galaxy cluster mass profiles

L. Pizzuti, B. Sartoris, S. Borgani, L. Amendola, K. Umetsu, A. Biviano, M. Girardi, P. Rosati, I. Balestra, G. B. Caminha, Brenda Louise Frye, A. Koekemoer, C. Grillo, M. Lombardi, A. Mercurio, M. Nonino

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We use high-precision kinematic and lensing measurements of the total mass profile of the dynamically relaxed galaxy cluster MACS J1206.2-0847 at z=0.44 to estimate the value of the ratio η=Ψ/Φ between the two scalar potentials in the linear perturbed Friedmann-Lemaitre-Robertson-Walker metric. An accurate measurement of this ratio, called anisotropic stress, could show possible, interesting deviations from the predictions of the theory of General Relativity, according to which Ψ should be equal to Φ. Complementary kinematic and lensing mass profiles were derived from exhaustive analyses using the data from the Cluster Lensing And Supernova survey with Hubble (CLASH) and the spectroscopic follow-up with the Very Large Telescope (CLASH-VLT). Whereas the kinematic mass profile tracks only the time-time part of the perturbed metric (i.e. only Φ), the lensing mass profile reflects the contribution of both time-time and space-space components (i.e. the sum Φ+Ψ). We thus express η as a function of the mass profiles and perform our analysis over the radial range 0.5 Mpc≤ r≤ r200=1.96 Mpc. Using a spherical Navarro-Frenk-White mass profile, which well fits the data, we obtain η(r200)=1.01 -0.28 +0.31 at the 68% C.L. We discuss the effect of assuming different functional forms for mass profiles and of the orbit anisotropy in the kinematic reconstruction. Interpreting this result within the well-studied f(R) modified gravity model, the constraint on η translates into an upper bound to the interaction length (inverse of the scalaron mass) smaller than 2 Mpc. This tight constraint on the f(R) interaction range is however substantially relaxed when systematic uncertainties in the analysis are considered. Our analysis highlights the potential of this method to detect deviations from general relativity, while calling for the need of further high-quality data on the total mass distribution of clusters and improved control on systematic effects.

Original languageEnglish (US)
Article number023
JournalJournal of Cosmology and Astroparticle Physics
Volume2016
Issue number4
DOIs
StatePublished - Apr 12 2016

Fingerprint

supernovae
gravitation
galaxies
profiles
kinematics
relativity
deviation
mass distribution
interactions
telescopes
scalars
orbits
anisotropy
estimates
predictions

Keywords

  • dark energy theory
  • galaxy clusters
  • gravitational lensing
  • modified gravity

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Pizzuti, L., Sartoris, B., Borgani, S., Amendola, L., Umetsu, K., Biviano, A., ... Nonino, M. (2016). CLASH-VLT: Testing the nature of gravity with galaxy cluster mass profiles. Journal of Cosmology and Astroparticle Physics, 2016(4), [023]. https://doi.org/10.1088/1475-7516/2016/04/023

CLASH-VLT : Testing the nature of gravity with galaxy cluster mass profiles. / Pizzuti, L.; Sartoris, B.; Borgani, S.; Amendola, L.; Umetsu, K.; Biviano, A.; Girardi, M.; Rosati, P.; Balestra, I.; Caminha, G. B.; Frye, Brenda Louise; Koekemoer, A.; Grillo, C.; Lombardi, M.; Mercurio, A.; Nonino, M.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2016, No. 4, 023, 12.04.2016.

Research output: Contribution to journalArticle

Pizzuti, L, Sartoris, B, Borgani, S, Amendola, L, Umetsu, K, Biviano, A, Girardi, M, Rosati, P, Balestra, I, Caminha, GB, Frye, BL, Koekemoer, A, Grillo, C, Lombardi, M, Mercurio, A & Nonino, M 2016, 'CLASH-VLT: Testing the nature of gravity with galaxy cluster mass profiles', Journal of Cosmology and Astroparticle Physics, vol. 2016, no. 4, 023. https://doi.org/10.1088/1475-7516/2016/04/023
Pizzuti, L. ; Sartoris, B. ; Borgani, S. ; Amendola, L. ; Umetsu, K. ; Biviano, A. ; Girardi, M. ; Rosati, P. ; Balestra, I. ; Caminha, G. B. ; Frye, Brenda Louise ; Koekemoer, A. ; Grillo, C. ; Lombardi, M. ; Mercurio, A. ; Nonino, M. / CLASH-VLT : Testing the nature of gravity with galaxy cluster mass profiles. In: Journal of Cosmology and Astroparticle Physics. 2016 ; Vol. 2016, No. 4.
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AU - Umetsu, K.

AU - Biviano, A.

AU - Girardi, M.

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AU - Caminha, G. B.

AU - Frye, Brenda Louise

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