Power Spectrum Analysis of the Two‐Degree Field QSO Sample Revisited | Zendy

Kazuhiro Yamamoto | Zendy

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Power Spectrum Analysis of the Two‐Degree Field QSO Sample Revisited

Author(s) -

Kazuhiro Yamamoto

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/382496

Subject(s) - spectral density , redshift , physics , spectrum (functional analysis) , constraint (computer aided design) , degree (music) , dark energy , field (mathematics) , astrophysics , distortion (music) , power (physics) , work (physics) , quantum mechanics , mathematics , statistics , cosmology , geometry , pure mathematics , amplifier , optoelectronics , cmos , galaxy , acoustics

We revisit the power spectrum analysis of the complete sample of the twodegree field (2dF) QSO redshift (2QZ) survey, as a complementary test of thework by Outram et al. (2003). A power spectrum consistent with that of the 2QZgroup is obtained. Differently from their approach, fitting of the powerspectrum is investigated incorporating the nonlinear effects, the geometricdistortion and the light-cone effect. It is shown that the QSO power spectrumis consistent with the $\Lambda$ cold dark matter (CDM) model with the matterdensity parameter $\Omega_m=0.2\sim0.5$. Our constraint on the densityparameter is rather weaker than that of the 2QZ group. We also show that theconstraint slightly depends on the equation of state parameter $w$ of the darkenergy. The constraint on $w$ from the QSO power spectrum is demonstrated,though it is not very tight.Comment: 15 pages, 5 figures, accepted for publication in the Astrophysical Journa

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