A coherent, sinusoidal peculiar velocity field of amplitude δυ/c ≃ 3 × 10-3 and wavelength λ ≃ 128h-1 Mpc could explain the apparent redshift periodicity seen in the recent pencil-beam survey of Broadhurst et al. Such a peculiar velocity field could arise if the power spectrum of density perturbations has a strong feature at about this wavelength (e.g., a bump). This explanation has additional predictions: the phase, period, and strength of the periodicity should vary in different directions; the strength of the periodicity should decrease at higher redshifts; and there should be more "thin" structures perpendicular to the line of sight than parallel to it.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
- Cosmic background radiation
- Galaxies: Redshifts