The Local Volume HI Survey (LVHIS)

ESO 381-G020

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 * LVHIS database * LVHIS homepage * next

Last updated on 18 Feb 2018. © Copyright CSIRO