# DDO 161 and UGCA 319: an isolated pair of nearby dwarf galaxies

## TL;DR

This study presents detailed observations of two nearby gas-rich dwarf galaxies, DDO 161 and UGCA 319, establishing their distances, isolation, and peculiar velocities, contributing to understanding dwarf galaxy environments.

## Contribution

The paper provides precise distance measurements and analyzes the dynamical isolation and velocities of the dwarf galaxy pair, highlighting their unique status among local galaxies.

## Key findings

- Distances of 6.03 Mpc and 5.75 Mpc for DDO 161 and UGCA 319
- The galaxies form an isolated pair with significant peculiar velocities
- All four galaxies have velocities towards the Virgo cluster

## Abstract

We report HST/ACS observations of two nearby gas-rich dwarf galaxies: DDO 161 and UGCA 319. Their distances determined via the Tip of the Red Giant Branch are 6.03 (-0.21/+0.29) Mpc and 5.75+-0.18 Mpc, respectively. The galaxies form an isolated pair dynamically well separated from the nearest neighbors: KK 176 (7.28+-0.29 Mpc) and NGC 5068 (5.16+-0.21 Mpc). All four galaxies have a bulk spatial peculiar velocity towards the Virgo cluster of ~158+-17 km/s in the Local Group rest frame and ~330 km/s with respect to the cluster center.