Peculiar Hubble Flows in Our Local Universe

Abstract

A formalism that simultaneously searches for the monopolar and dipolar peculiar velocities is presented. The formalism is applied to (1) the Mark III catalogue, (2) Lauer and Postman's Abell cluster catalogue, and (3) Riess et al.'s Type Ia supernova sample. The emphasis is drawn to the monopolar peculiar velocities, i.e., peculiar Hubble flows, within these samples. The samples show inconsistent peculiar Hubble flows within a depth of $\sim 60h^{-1}$ Mpc. Beyond a depth of $\sim 80h^{-1}$ Mpc, the Hubble flows of all samples converge to the global Hubble flow to better than 10% at the $2\sigma$ level. The results are compared with theoretical predictions. They at face value disfavor models predicting smaller peculiar velocities such as the tilted Cold Dark Matter model. Limitations of the catalogues are discussed, so are ways to improve the catalogues so that an accurate map of Hubble flows in our local universe can be drawn and be compared with theoretical predictions.

20 latex pages and 8 figures. Final version

References in corpus (4)

• A Precise Distance Indicator: Type Ia Supernova Multicolor Light Curve Shapes
• The Four-Year COBE Normalization and Large-Scale Structure
• Homogeneous Velocity-Distance Data for Peculiar Velocity Analysis. III. The Mark III Catalog of Galaxy Peculiar Velocities
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• Using spatial curvature with HII galaxies and cosmic chronometers to explore the tension in $H_0$
• The Maximum Angular-Diameter Distance in Cosmology
• A Two-point Diagnostic for the HII Galaxy Hubble Diagram
• Model Selection based on the Angular-Diameter Distance to the Compact Structure in Radio Quasars
• Testing Cold Dark Matter Models Using Hubble Flow Variations