DDO 161 and UGCA 319: an isolated pair of nearby dwarf galaxies
| Autor: | Igor D. Karachentsev, R. B. Tully, Edward J. Shaya, V. E. Karachentseva, L. N. Makarova, Luca Rizzi |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
010308 nuclear & particles physics Local Group Astronomy FOS: Physical sciences Astronomy and Astrophysics Astrophysics Rest frame 01 natural sciences Virgo Cluster Astrophysics - Astrophysics of Galaxies Galaxy Red-giant branch Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Cluster (physics) Peculiar velocity 010303 astronomy & astrophysics Dwarf galaxy |
| Popis: | 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. 5 pages, 3 figures, 3 tables, accepted in MNRAS |
| Databáze: | OpenAIRE |
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