TY - JOUR
T1 - The VIMOS Public Extragalactic Redshift Survey. Measuring the growth rate of structure around cosmic voids
AU - Hawken, A. J.
AU - Granett, B. R.
AU - Iovino, A.
AU - Guzzo, L.
AU - Peacock, J. A.
AU - de la Torre, S.
AU - Garilli, B.
AU - Bolzonella, M.
AU - Scodeggio, M.
AU - Abbas, U.
AU - Adami, C.
AU - Bottini, D.
AU - Cappi, A.
AU - Cucciati, O.
AU - Davidzon, I.
AU - Fritz, A.
AU - Franzetti, P.
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 - Bel, J.
AU - Branchini, E.
AU - De Lucia, G.
AU - Ilbert, O.
AU - Moscardini, L.
AU - Percival, W. J.
PY - 2017/11/1
Y1 - 2017/11/1
N2 - We aim to develop a novel methodology for measuring thegrowth rate of
structure around cosmic voids. We identified voids in the completed
VIMOS Public Extragalactic Redshift Survey (VIPERS), using an algorithm
based on searching for empty spheres. We measured the cross-correlation
between the centres of voids and the complete galaxy catalogue. The
cross-correlation function exhibits a clear anisotropy in both VIPERS
fields (W1 and W4), which is characteristic of linear redshift space
distortions. By measuring the projected cross-correlation and then
de-projecting it we are able to estimate the un-distorted
cross-correlation function. We propose that given a sufficiently
well-measured cross-correlation function one should be able to measure
the linear growth rate of structure by applying a simple linear Gaussian
streaming model for the redshift space distortions (RSD). Our study of
voids in 306 mock galaxy catalogues mimicking the VIPERS fields suggests
that VIPERS is capable of measuring β, the ratio of the linear
growth rate to the bias, with an error of around 25%. Applying our
method to the VIPERS data, we find a value for the redshift space
distortion parameter, β = 0.423-0.108+0.104
which, given the bias of the galaxy population we use, gives a linear
growth rate of f σ8 =
0.296-0.078+0.075 at z = 0.727. These results are
consistent with values observed in parallel VIPERS analyses that use
standard techniques.
Based on observations collected at the European Southern Observatory,
Cerro Paranal, Chile, using the Very Large Telescope under programs
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.
AB - We aim to develop a novel methodology for measuring thegrowth rate of
structure around cosmic voids. We identified voids in the completed
VIMOS Public Extragalactic Redshift Survey (VIPERS), using an algorithm
based on searching for empty spheres. We measured the cross-correlation
between the centres of voids and the complete galaxy catalogue. The
cross-correlation function exhibits a clear anisotropy in both VIPERS
fields (W1 and W4), which is characteristic of linear redshift space
distortions. By measuring the projected cross-correlation and then
de-projecting it we are able to estimate the un-distorted
cross-correlation function. We propose that given a sufficiently
well-measured cross-correlation function one should be able to measure
the linear growth rate of structure by applying a simple linear Gaussian
streaming model for the redshift space distortions (RSD). Our study of
voids in 306 mock galaxy catalogues mimicking the VIPERS fields suggests
that VIPERS is capable of measuring β, the ratio of the linear
growth rate to the bias, with an error of around 25%. Applying our
method to the VIPERS data, we find a value for the redshift space
distortion parameter, β = 0.423-0.108+0.104
which, given the bias of the galaxy population we use, gives a linear
growth rate of f σ8 =
0.296-0.078+0.075 at z = 0.727. These results are
consistent with values observed in parallel VIPERS analyses that use
standard techniques.
Based on observations collected at the European Southern Observatory,
Cerro Paranal, Chile, using the Very Large Telescope under programs
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.
KW - large-scale structure of Universe
KW - cosmology: observations
KW - cosmological parameters
KW - gravitation
U2 - 10.1051/0004-6361/201629678
DO - 10.1051/0004-6361/201629678
M3 - Journal article
SN - 0004-6361
VL - 607
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
M1 - A54
ER -