The Local Volume HI Survey (LVHIS)

UKS 1424-460

UKS 1424-460 (HIPASS J1428-46) is a Magellanic irregular galaxy (type IB(s)m) of low surface brightness, located close to a foreground star. Its location and TRGB distance of 3.58 ± 0.33 Mpc (Karachentsev et al. 2004) places it in the far outskirts of the Cen A group. Its nearest neighbours are ESO 272-G025 (HIPASS J1443-44) and ESO 222-G010 (HIPASS J1434-49) at projected distances of 188 arcmin and 200 arcmin, respectively. Both are located well behind UKS1424-460. Our ATCA data show an extended, regularly rotating HI disc. We measure an HI flux density of 16.7 Jy km/s, in agreement with HIPASS (Koribalski et al. 2004), corresponding to an HI mass of MHI = 5.0 × 107 M. Begum et al. (2008) observed UKS 1424-460 as part of the FIGGS project. They measure an HI diameter of 6.55 arcmin (~2.7 × the optical diameter) and an HI flux density of FHI = 17.4 ± 1.7 Jy km/s, in agreement with our measurements. Using 3D FAT Kamphuis et al. (2015) obtain an HI rotation curve indicating vrot = 22.0 km/s at Rmax = 3.2 kpc (for i = 74.6 degr and PA = 122.8 degr) and Mdyn = 3.6 × 108 M; note these values are highly uncertain. Optical magnitudes are hard to obtain due to significant foreground dust and stars. Kaisin et al. (2007) and Cote et al. (2009) show a marginal detection of Hα emission on the north-western (approaching) side of the galaxy. They derive an SFR of 1.4 × 10-4 M/yr.

Reference: Koribalski et al. 2018 * LVHIS database * LVHIS homepage * next

Last updated on 18 Feb 2018. © Copyright CSIRO