The Local Volume HI Survey

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 F_HI = 138.4 Jy km/s, ~10% more than the published HIPASS F_HI (Koribalski et al. 2004), and derive M_HI = 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 F_HI = 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 * LVHIS database * LVHIS homepage * next