ESO 274-G001 (HIPASS
J1514-46) is a late-type spiral galaxy in the outskirts of the Cen A
group, located at a TRGB distance of 3.09 ± 0.23 Mpc (Karachentsev et
al. 2007). Its Local Group velocity of 360 km/s suggests peculiar motions of
~130 km/s towards the Cen A group. Its nearest known neighbours are
ESO 223-G009 (HIPASS J1501-48) and HIPASS J1526-51 at projected distances of
160 arcmin and 287 arcmin, respectively. The edge-on stellar disc of
ESO 274-G001 is obscured by Galactic foreground dust and stars. Our ATCA data
show an extended, regular rotating HI disc with signs of a minor warp in the
outskirts (see also Koribalski 2008). We measure FHI = 138.4
Jy km/s, ~10% more than the published HIPASS FHI (Koribalski et
al. 2004), and derive MHI = 3.1 × 108
M☉. We measure HI dimensions of about 17 arcmin ×
4 arcmin, corresponding to 15 kpc × 3 kpc. Using high-resolution
(10 arcsec) ATCA HI maps O'Brien et al. (2010) measure FHI = 152.6
Jy km/s, which seems rather high compared to our measurements. They derive
a maximum rotational velocity of 89.4 km/s. TiRiFiC modeling shows that
ESO 274-G001 is slightly warped. The scale height obtained in the best-fit
model is ~250 pc. Hα imaging by Rossa & Dettmar (2003) reveals prominent
extraplanar ionised gas. Lee (2007) and Cote et al. (2009) also obtain Hα
images and find most HII regions located in the southern (approaching) side
of the galaxy; they derive an SFR of 1.5 × 10-2
M☉/yr. Our ATCA 20-cm radio continuum maps reveal extended
emission in the disc as well as a bright nucleus.
Reference:
Koribalski et al. 2018
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