10-1103-PhysRevD-93-0233525.pdf (1.97 MB)
Galaxy and mass assembly: redshift space distortions from the clipped galaxy field
journal contribution
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 NorbergWe 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
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- Published
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- Published version
Journal
Physical Review DISSN
1550-7998Publisher
American Physical SocietyExternal DOI
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2Volume
93Page range
023525Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-05-16First Open Access (FOA) Date
2016-05-16First Compliant Deposit (FCD) Date
2016-05-16Usage metrics
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