A List of Groups of Dwarf Galaxies in the Local Supercluster

TL;DR

This paper catalogs 126 dwarf galaxy groups in the Local Supercluster, highlighting their properties, distribution, and dark matter content, revealing a continuous sequence with dwarf galaxy associations.

Contribution

It provides the first comprehensive list of dwarf galaxy groups, analyzing their sizes, velocities, and dark matter content, emphasizing their relation to dwarf galaxy associations.

Findings

Most groups are in low-density regions.

Groups have characteristic sizes around 30 kpc.

High mass-to-luminosity ratios indicate substantial dark matter.

Abstract

We report a list of groups consisting of dwarf galaxies only. The sample contains 126 objects, mainly combined in pairs. The most populated group contains six dwarf galaxies. The majority of systems considered reside in the low-density regions and evolve unaffected by massive galaxies. The characteristic sizes and velocity dispersions of groups are 30 kpc and 11 km/s, respectively. They resemble the associations of dwarf galaxies, but are more compact. On the whole, groups and associations form a continuous sequence. Alike the associations, our groups possess high mass-to-luminosity ratios, what is indicative of a large amount of dark matter present in these systems.