HIPASS J1247-77
is a highly obscured (AB = 2.75) dwarf irregular galaxy located
at α,δ(J2000) = 12:47:32.4, -77:34:53.9 as measured using our ATCA
HI distribution (see also Kilborn et al. 2002). HST ACS images show a young
stellar population and one bright star cluster; the galaxy's TRGB distance
is 3.16 ± 0.25 Mpc (Karachentsev et al. 2006). Our ATCA HI data reveal
a resolved source, centred on the faint optical counterpart, with a regular
velocity field (PA ~ 55 degr). We measure vhel = 413 km/s and
FHI = 4.2 Jy km/s, in agreement with HIPASS (Koribalski et al.
2004), and derive MHI = 107 M☉.
Furthermore, our ATCA data reveal a neighbouring HI source (not shown here) at
α,δ(J2000) = 12:48:50.3, -77:49:30.6 without any obvious optical
counterpart. It has a systemic velocity of ~402 km/s and FHI =
0.3 Jy km/s. We derive MHI = 7 × 105
M☉, assuming the same distance as above. GALEX UV
images are not available at either position.
The nearest neighbour to HIPASS J1247-77 is IC 3104.
Reference:
Koribalski et al. 2018
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