The DWT Power Spectrum of the two-degree Field Galaxy Redshift Survey
| dc.creator | Cai, Yan-Chuan | |
| dc.creator | Pan, Jun | |
| dc.creator | Zhao, Yong-Heng | |
| dc.creator | Feng, Long-Long | |
| dc.creator | Fang, Li-Zhi | |
| dc.date | 2006-09-14 | |
| dc.date.accessioned | 2026-07-07T11:26:03Z | |
| dc.date.available | 2026-07-07T11:26:03Z | |
| dc.description | The power spectrum of the two-degree Field Galaxy Redshift Survey (2dFGRS) sample is estimated with the discrete wavelet transform (DWT) method. The DWT power spectra within $0.04 <k< 2.3 h$Mpc$^{-1}$ are measured for three volume-limited samples defined in connective absolute magnitude bins $-19 \sim -18$, $-20 \sim -19$ and $-21 \sim -20$. We show that the DWT power spectrum can effectively distinguish $Λ$CDM models of $σ_8=0.84$ and $σ_8=0.74$. We adopt maximum likelihood method to perform three-parameter fitting with bias parameter $b$, pairwise velocity dispersion $σ_{pv}$ and redshift distortion parameter $β=Ω_m^{0.6}/b$ to the measured DWT power spectrum. Fitting results denotes that in a $σ_8=0.84$ universe the best fitted $Ω_m$ given by the three samples are consistent in the range $0.28 \sim 0.36$, and the best fitted $σ_{pv}$ are $398^{+35}_{-27}$, $475^{+37}_{-29}$ and $550 \pm 20$km/s for the three samples, respectively. However in the model of $σ_8=0.74$, our three samples give very different values of $Ω_m$. We repeat the fitting by using empirical formula of redshift distortion. The result of the model of low $σ_8$ is still poor, especially, one of the best value $σ_{pv}$ is as large as $10^3$km/s. The power spectrum of 2dFGRS seems in disfavor of models with low amplitude of density fluctuations. | |
| dc.description | 11 pages, 9 figures. submitted to MNRAS. submitted to MNRAS | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0609411 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0609411 | |
| dc.identifier | AIPConf.Proc.966:87-94,2008 | |
| dc.identifier | doi:10.1063/1.2837025 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/195699 | |
| dc.subject | Astrophysics | |
| dc.title | The DWT Power Spectrum of the two-degree Field Galaxy Redshift Survey | |
| dc.type | text |