• DOI:10.1051/0004-6361/201630276
• Corpus ID: 73675347

The VIMOS Public Extragalactic Redshift Survey (VIPERS). Gravity test from the combination of redshift-space distortions and galaxy-galaxy lensing at $0.5 < z < 1.2$

@article{Torre2016TheVP,
  title={The VIMOS Public Extragalactic Redshift Survey (VIPERS). Gravity test from the combination of redshift-space distortions and galaxy-galaxy lensing at \$0.5 < z < 1.2\$},
  author={Sylvain de la Torre and E. Jullo and Carlo Giocoli and Andrea Pezzotta and Julien Bel and Benjamin R Granett and Luigi Guzzo and Bianca Garilli and Marco Scodeggio and Micol Bolzonella and Ummi Abbas and Christophe Adami and Dario Bottini and Alberto Cappi and Olga Cucciati and Iary Davidzon and Paolo Franzetti and Alexander Fritz and Angela Iovino and Janusz Krywult and Vincent Le Brun and Olivier Le F{\`e}vre and Dario Maccagni and Katarzyna Małek and Federico Marulli and Maria del Carmen Polletta and Agnieszka Pollo and L. A. M. Tasca and Rita Tojeiro and D. Vergani and Alessandro Zanichelli and S. Arnouts and Enzo Franco Branchini and Jean Coupon and Gabriella de Lucia and Olivier Ilbert and Thibaud Moutard and Lauro Moscardini and John A Peacock and R. Benton Metcalf and Francisco Prada and Gustavo Yepes},
  journal={Astronomy and Astrophysics},
  year={2016},
  volume={608},
  pages={1-21}
}

• S. L. Torre, E. Jullo, +39 authors G. Yepes
• Published 16 December 2016
• Physics
• Astronomy and Astrophysics

We carry out a joint analysis of redshift-space distortions and galaxy-galaxy lensing, with the aim of measuring the growth rate of structure; this is a key quantity for understanding the nature of gravity on cosmological scales and late-time cosmic acceleration. We make use of the final VIPERS redshift survey dataset, which maps a portion of the Universe at a redshift of z ≃ 0.8, and the lensing data from the CFHTLenS survey over the same area of the sky. We build a consistent theoretical model that combines non-linear galaxy biasing and redshift-space distortion models, and confront it with observations. The two probes are combined in a Bayesian maximum likelihood analysis to determine the growth rate of structure at two redshifts z = 0.6 and z = 0.86. We obtain measurements of fσ8(0.6) = 0.48 ± 0.12 and fσ8(0.86) = 0.48 ± 0.10. The additional galaxy-galaxy lensing constraint alleviates galaxy bias and σ8 degeneracies, providing direct measurements of f and σ8: [f(0.6),σ8(0.6)] = [0.93 ± 0.22,0.52 ± 0.06] and [f(0.86),σ8(0.86)] = [0.99 ± 0.19,0.48 ± 0.04]. These measurements are statistically consistent with a Universe where the gravitational interactions can be described by General Relativity, although they are not yet accurate enough to rule out some commonly considered alternatives. Finally, as a complementary test we measure the gravitational slip parameter, EG, for the first time at z > 0.6. We find values of EG(0.6) = 0.16±0.09 and EG(0.86) = 0.09±0.07, when EG is averaged over scales above 3 h-1 Mpc. We find that our EG measurements exhibit slightly lower values than expected for standard relativistic gravity in a ΛCDM background, although the results are consistent within 1−2σ.Key words: large-scale structure of Universe / cosmology: observations / cosmological parameters / dark energy / galaxies: high-redshift⋆ Based on observations collected at the European Southern Observatory, Cerro Paranal, Chile, using the Very Large Telescope under programmes 182.A-0886 and partly 070.A-9007. Also based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX and the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS. The VIPERS web site is http://www.vipers.inaf.it/