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Titolo: Simulations of deep pencil-beam redshift surveys
Autore: Yoshida, N; Colberg, J; White, SDM; Evrard, AE; MacFarland, TJ; Couchman, HMP; Jenkins, A; Frenk, CS; Pearce, FR; Efstathiou, G; Peacock, JA; Thomas, PA;
- Indirizzi:
- Max Planck Inst Astrophys, D-85740 Garching, Germany Max Planck Inst Astrophys Garching Germany D-85740 740 Garching, Germany Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA Univ Michigan Ann ArborMI USA 48109 , Dept Phys, Ann Arbor, MI 48109 USA McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada McMaster Univ Hamilton ON Canada L8S 4M1 on, Hamilton, ON L8S 4M1, Canada Univ Durham, Dept Phys, Durham DH1 3LE, England Univ Durham Durham England DH1 3LE m, Dept Phys, Durham DH1 3LE, England Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England Univ Cambridge Cambridge England CB3 0HA ron, Cambridge CB3 0HA, England Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland Royal Observ Edinburgh Midlothian Scotland EH9 3HJ , Midlothian, Scotland Univ Sussex, Ctr Astron, CPES, Brighton BN1 9QH, E Sussex, England Univ Sussex Brighton E Sussex England BN1 9QH BN1 9QH, E Sussex, England
- Titolo Testata:
- MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
fascicolo: 2,
volume: 325,
anno: 2001,
pagine: 803 - 816
- SICI:
- 0035-8711(20010801)325:2<803:SODPRS>2.0.ZU;2-B
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- LARGE-SCALE DISTRIBUTION; COLD DARK-MATTER; GALACTIC POLE; PERIODICITY; GALAXIES; UNIVERSE;
- Keywords:
- galaxies : clusters : general; cosmology : theory; large-scale structure of Universe;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 35
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Yoshida, N Max Planck Inst Astrophys, D-85740 Garching, Germany Max PlanckInst Astrophys Garching Germany D-85740 g, Germany
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- Citazione:
- N. Yoshida et al., "Simulations of deep pencil-beam redshift surveys", M NOT R AST, 325(2), 2001, pp. 803-816
Abstract
We create mock pencil-beam redshift surveys from very large cosmological N-body simulations of two cold dark matter (CDM) cosmogonies, an Einstein-deSitter model (tau CDM) and a flat model with Ohm (0) = 0.3 and a cosmological constant (Lambda 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-independentcatalogues from our tau CDM (Lambda 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 tau CDM (Lambda 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 similar to 130 h(-1) Mpc observed by Broadhurst et al. has a priori probability well below 10(-3).
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/05/13 alle ore 03:16:04