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
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