Year: 2006
Type: article
Abstract: We have measured the cosmic momentum power spectrum from the peculiar velocities of galaxies in the SFI sample. The SFI catalog contains field spiral galaxies with radial peculiar velocities derived from the I-band Tully-Fisher relation. As a natural measure of the large-scale peculiar velocity field, we use the cosmic momentum field that is defined as the peculiar velocity field weighted by local number of galaxies. We have shown that the momentum power spectrum can be derived from the density power spectrum for the constant linear biasing of galaxy formation, which makes it possible to estimate β_S = Ω_m^{0.6} / b_S parameter precisely where Ω_m is the matter density parameter and b_S is the bias factor for optical spiral galaxies. At each wavenumber k we estimate β_S(k) as the ratio of the measured to the derived momentum power over a wide range of scales (0.026 h^{-1}Mpc
Source: The Astrophysical Journal
DOI: 10.1086/498258
Authors: Chan‐Gyung Park, Changbom Park
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2096343289