Large‐Scale Power Spectrum from Peculiar Velocities
نویسندگان
چکیده
منابع مشابه
Cosmological Parameters and Power Spectrum from Peculiar Velocities
The power spectrum of mass density fluctuations is evaluated from the Mark III and the SFI catalogs of peculiar velocities by a maximum likelihood analysis, using parametric models for the power spectrum and for the errors. The applications to the two different data sets, using generalized CDM models with and without COBE normal-ization, give consistent results. The general result is a relative...
متن کاملLarge-scale Mass Power Spectrum from Peculiar Velocities
This is a brief progress report on a long-term collaborative project to measure the power spectrum (PS) of mass density fluctuations from the Mark III and the SFI catalogs of peculiar velocities. 2 The PS is estimated by applying maximum likelihood analysis, using generalized CDM models with and without COBE normalization. The application to both catalogs yields fairly similar results for the P...
متن کاملLarge-scale Power Spectrum from Peculiar Velocities via Likelihood Analysis
The power spectrum (PS) of mass density fluctuations, independent of “biasing”, is estimated from the Mark III catalog of peculiar velocities using Bayesian statistics. A parametric model is assumed for the PS, and the free parameters are determined by maximizing the probability of the model given the data. The method has been tested using detailed mock catalogs. It has been applied to generali...
متن کاملCosmological Density and Power Spectrum from Peculiar Velocities: Nonlinear Corrections and Pca
We allow for nonlinear effects in the likelihood analysis of galaxy peculiar velocities, and obtain ∼ 35%-lower values for the cosmological density parameter Ωm and for the amplitude of mass-density fluctuations σ8Ω 0.6 m . The power spectrum in the linear regime is assumed to be of the flat ΛCDM model (h = 0.65, n = 1, COBE normalized) with only Ωm as a free parameter. Since the likelihood is ...
متن کاملPower Spectrum Shape from Peculiar Velocity Data
We constrain the velocity power spectrum shape parameter Γ in linear theory using the nine bulk–flow and shear moments estimated from four recent peculiar velocity surveys. For each survey, a likelihood function for Γ was found after marginalizing over the power spectrum amplitude σ8Ω 0.6 m using constraints obtained from comparisons between redshift surveys and peculiar velocity data. In order...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1997
ISSN: 0004-637X,1538-4357
DOI: 10.1086/303894