ESO 381-G020 (HIPASS
J1246-33) is a dwarf irregular galaxy in the Cen A group, located at
a TRGB distance of 5.44 ± 0.37 Mpc (Karachentsev et al. 2007). Its outer
stellar disc has a slightly triangular shape, appearing much wider in the SE
than the NW. Our ATCA HI data reveal a well-resolved, regular rotating disc,
~10 times more massive than that of its nearest neighbour ESO 381-G018 (HIPASS
J1244-35). The mean HI velocity field indicates a mild warp of the outer HI
disc (Cote et al. 2000, Kirby et al. 2012). We measure FHI = 32.8
Jy km/s, in agreement with HIPASS (Koribalski et al. 2004), and derive
MHI = 2.3 × 108 M☉. In contrast
to its neighbour, ESO 381-G020 is clearly detected in Hα, indicating
ongoing star formation (Lee et al. 2007, Bouchard et al. 2009, Cote et al.
2009) at a rate of ~3-6 × 10-3 M☉/yr; see
also Crnojevic et al. (2011).
Reference:
Koribalski et al. 2018
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