Local dark energy: HST evidence from the vicinity of the M 81/M 82 galaxy group

TL;DR

This study uses HST observations to show that dark energy influences local galaxy group dynamics, with local dark energy density comparable to the global value, consistent with previous findings.

Contribution

It provides observational evidence that dark energy affects local galaxy group expansion, aligning local dark energy density with the global value.

Findings

Dark energy dominates local expansion flows.

Local dark energy density is near the global density.

Results agree with previous local universe studies.

Abstract

The Hubble Space Telescope observations of the nearby galaxy group M 81/M 82 and its vicinity indicate that the expansion outflow around the group is dominated by the antigravity of the dark energy background. The local density of dark energy in the area is estimated to be near the global dark energy density or perhaps exactly equal to it. This conclusion agrees with our previous results for the Local group vicinity and the vicinity of the Cen A/M 83 group.