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Galaxy and mass assembly: redshift space distortions from the clipped galaxy field

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posted on 2023-06-09, 01:16 authored by F Simpson, C Blake, J A Peacock, I K Baldry, J Bland-Hawthorn, A F Heavens, C Heymans, Jonathan LovedayJonathan Loveday, P Norberg
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 d g <4 we measure the normalized growth rate fs 8 (z=0.18)=0.29±0.10 .

Funding

Astronomy rolling grant; G0278; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I000976/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review D

ISSN

1550-7998

Publisher

American Physical Society

Issue

2

Volume

93

Page range

023525

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-05-16

First Open Access (FOA) Date

2016-05-16

First Compliant Deposit (FCD) Date

2016-05-16

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