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Simulations of deep pencil-beam redshift surveys

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posted on 2023-06-08, 08:56 authored by N Yoshida, J Colberg, S D M White, A E Evrard, T J MacFarland, H M P Couchman, A Jenkins, C S Frenk, F R Pearce, G Efstathiou, J A Peacock, Peter ThomasPeter Thomas
We create mock pencil-beam redshift surveys from very large cosmological N-body simulations of two cold dark matter (CDM) cosmogonies, an Einstein–de Sitter model (tCDM) and a flat model with O0=0.3 and a cosmological constant (?CDM). We use these to assess the significance of the apparent periodicity discovered by Broadhurst et al. Simulation particles are tagged as ‘galaxies’ so as to reproduce observed present-day correlations. They are then identified along the past light-cones of hypothetical observers to create mock catalogues with the geometry and the distance distribution of the Broadhurst et al. data. We produce 1936 (2625) quasi-independent catalogues from our tCDM (?CDM) simulation. A couple of large clumps in a catalogue can produce a high peak at low wavenumbers in the corresponding one-dimensional power spectrum, without any apparent large-scale periodicity in the original redshift histogram. Although the simulated redshift histograms frequently display regularly spaced clumps, the spacing of these clumps varies between catalogues and there is no ‘preferred’ period over our many realizations. We find only a 0.72 (0.49) per cent chance that the highest peak in the power spectrum of a tCDM (?CDM) catalogue has a peak-to-noise ratio higher than that in the Broadhurst et al. data. None of the simulated catalogues with such high peaks shows coherently spaced clumps with a significance as high as that of the real data. We conclude that in CDM universes, the regularity on a scale of ~130 h-1 Mpc observed by Broadhurst et al. has a priori probability well below 10-3.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

2

Volume

325

Page range

803-816

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

First Open Access (FOA) Date

2016-03-22

First Compliant Deposit (FCD) Date

2017-03-07

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