AM 0704-582 (HIPASS
J0705-58) is also known as the Argo Dwarf Irregular. It is a rather
isolated, low surface brightness galaxy at a TRGB distance of 4.90 ±
0.45 Mpc (Karachentsev et al. 2003). Parodi et al. (2002) and Kirby et al.
(2008) measure basic optical and infrared properties, respectively. The
extremely low surface brightness of AM0704-582 makes it hard to determine
its shape. Using HIPASS, Koribalski et al. (2004) fit an HI systemic velocity
of 564 ± 2 km/s; no optical velocity measurement is available yet. Our
ATCA HI maps show a well-resolved, regularly rotating disc extending well
beyond the faint stellar body. We measure FHI = 33 Jy km/s, in
agreement with HIPASS (Koribalski et al. 2004), and derive MHI =
1.9 × 108 M☉. Kirby et al. (2012) analyse
the HI kinematics and discuss the galaxy in detail. Using 3D FAT Kamphuis et
al. (2015) obtain an HI rotation curve indicating vrot = 38.5 km/s
at Rmax = 6.1 kpc (for i = 53.6 degr and PA = 275.9 degr) and
Mdyn = 2.1 × 109 M☉.
Reference:
Koribalski et al. 2018
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