New radial velocities for 40 nearby dwarf galaxies

TL;DR

This study reports new radial velocity measurements for 40 nearby dwarf galaxies using the BTA telescope, identifying several as probable companions to larger Local Volume galaxies and revealing a diffuse association in the Local Void.

Contribution

The paper provides new radial velocity data for 40 dwarf galaxies, many of which are newly identified as nearby and associated with larger galaxies or located in the Local Void.

Findings

Half of the galaxies have distances within 11 Mpc, linking them to known Local Volume galaxies.

Six isolated objects form a diffuse group in the Local Void.

New velocities help clarify the local galaxy distribution.

Abstract

The 6-meter BTA telescope has been used to determine radial velocities for 40 galaxies, recently identified in the DESI Legacy Imaging Surveys as nearby objects. Half of them have kinematic distances within 11 Mpc being new probable companions to the bright Local Volume galaxies: NGC628, Maffei2, NGC2787, M81, NGC4605 and NGC4631. Six relatively isolated objects with heliocentric velocities in the range of $[-150, +70]$km s$^{-1}$, together with the blue compact dwarf NGC 6789, form a diffuse association of dwarf galaxies located in the near part of the Local Void.