TY - JOUR
T1 - 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
AU - de la Torre, S.
AU - Jullo, E.
AU - Giocoli, C.
AU - Pezzotta, A.
AU - Bel, J.
AU - Granett, B. R.
AU - Guzzo, L.
AU - Garilli, B.
AU - Scodeggio, M.
AU - Bolzonella, M.
AU - Abbas, U.
AU - Adami, C.
AU - Bottini, D.
AU - Cappi, A.
AU - Cucciati, O.
AU - Davidzon, I.
AU - Franzetti, P.
AU - Fritz, A.
AU - Iovino, A.
AU - Krywult, J.
AU - Le Brun, V.
AU - Le Fèvre, O.
AU - Maccagni, D.
AU - Małek, K.
AU - Marulli, F.
AU - Polletta, M.
AU - Pollo, A.
AU - Tasca, L. A. M.
AU - Tojeiro, R.
AU - Vergani, D.
AU - Zanichelli, A.
AU - Arnouts, S.
AU - Branchini, E.
AU - Coupon, J.
AU - De Lucia, G.
AU - Ilbert, O.
AU - Moutard, T.
AU - Moscardini, L.
AU - Peacock, J. A.
AU - Metcalf, R. B.
AU - Prada, F.
AU - Yepes, G.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - 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
E̅G(0.6) = 0.16±0.09 and
E̅G(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.
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/
AB - 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
E̅G(0.6) = 0.16±0.09 and
E̅G(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.
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/
KW - large-scale structure of Universe
KW - cosmology: observations
KW - cosmological parameters
KW - dark energy
KW - galaxies: high-redshift
U2 - 10.1051/0004-6361/201630276
DO - 10.1051/0004-6361/201630276
M3 - Journal article
SN - 0038-0938
VL - 608
JO - Solar Physics
JF - Solar Physics
ER -