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

Abstract We report Hubble Space Telescope/Advanced Camera for Surveys 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 $6.03_{-0.21}^{+0.29}$ and 5.75 ± 0.18 Mpc, respectively. The galaxies form an isolated p...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society. Letters 2017-07, Vol.469 (1), p.L113-L117
Main Authors: Karachentsev, I. D., Makarova, L. N., Tully, R. B., Rizzi, L., Karachentseva, V. E., Shaya, E. J.
Format: Article
Language:English
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Summary:Abstract We report Hubble Space Telescope/Advanced Camera for Surveys 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 $6.03_{-0.21}^{+0.29}$ and 5.75 ± 0.18 Mpc, respectively. The galaxies form an isolated pair dynamically well separated from the nearest neighbours: 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−1 in the Local Group rest frame and ∼330 km s−1 with respect to the cluster centre.
ISSN:1745-3925
1745-3933
DOI:10.1093/mnrasl/slx061