Galaxy and mass assembly: redshift space distortions from the clipped galaxy field
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
We present the first cosmological measurement derived from a galaxy density field subject to a “clipping” transformation. By enforcing an upper bound on the galaxy number density field in the galaxy and mass assembly survey (GAMA), contributions from the nonlinear processes of virialization and galaxy bias are greatly reduced. This leads to a galaxy power spectrum which is easier to model, without calibration from numerical simulations. We develop a theoretical model for the power spectrum of a clipped field in redshift space, which is exact for the case of anisotropic Gaussian fields. Clipping is found to extend the applicability of the conventional Kaiser prescription by more than a factor of 3 in wave numbers, or a factor of 30 in terms of the number of Fourier modes. By modeling the galaxy power spectrum on scales k<0.3 hMpc−1 and density fluctuations δg<4 we measure the normalized growth rate fσ8(z=0.18)=0.29±0.10.
Date Issued
2016-01-27
Date Acceptance
2016-01-27
Citation
Physical Review D, 2016, 93 (2)
ISSN
1550-7998
Publisher
American Physical Society
Journal / Book Title
Physical Review D
Volume
93
Issue
2
Copyright Statement
© 2016 American Physical Society
Sponsor
Imperial College Trust
Science and Technology Facilities Council (STFC)
Grant Number
N/A
ST/K00607X/1
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Physics
LARGE-SCALE STRUCTURE
BARYON ACOUSTIC-OSCILLATIONS
DARK ENERGY SURVEY
COSMOLOGICAL PARAMETER CONSTRAINTS
MATTER POWER SPECTRUM
GROWTH-RATE
SDSS
GAMA
INFORMATION
DENSITY
Nuclear & Particles Physics
0201 Astronomical And Space Sciences
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
0206 Quantum Physics
Publication Status
Published
Article Number
023525