A1 Refereed original research article in a scientific journal

Local expansion flows of galaxies: quantifying acceleration effect of dark energy




AuthorsChernin AD, Teerikorpi P

Publication year2013

JournalAstronomical and Astrophysical Transactions

Number in series2

Volume28

Issue2

First page 177

Last page184

Number of pages8

ISSN1055-6796


Abstract

The nearest expansion flow of galaxies observed around the Local group is studied as an archetypical example of the newly discovered local expansion flows around groups and clusters of galaxies in the nearby Universe. The flow is accelerating due to the antigravity produced by the universal dark energy background. We introduce a new acceleration measure of the flow which is the dimensionless ``acceleration parameter" Q (x) = x - x-2 depending on the normalized distance x only. The parameter is zero at the zero-gravity distance x = 1, and Q(x) ∝ x, when x ≫ 1. At the distance x = 3, the parameter Q = 2.9. Since the expansion flows have a self-similar structure in normalized variables, we expect that the result is valid as well for all the other expansion flows around groups and clusters of galaxies on the spatial scales from ˜ 1 to ˜ 10 Mpc everywhere in the Universe.




Last updated on 2024-26-11 at 10:32