The Local Volume HI Survey

ESO 410-G005 (HIPASS J0015-32) is a dwarf galaxy at TRGB distance of 1.92 ± 0.19 Mpc (Karachentsev et al. 2000). Its stellar morphology resembles that of a dwarf elliptical, while our HI detections at v_hel = 20 - 52 km/s, both with the Parkes telescope and the ATCA, suggest that it is most likely a transition-type dwarf galaxy. No HI emission was detected with the ATCA at velocities around +160 km/s where Bouchard et al. (2005) report a detection using the Parkes telescope. Using our ATCA HI data we determine a center position of α,δ(J2000) = 00:15:30.9, -32:10:52, an HI diameter of 1.5 arcmin × 1.0 arcmin (840 pc × 560 pc), PA = 320 degr, a systemic velocity of v_sys = 36 ± 2 km/s (v_LG = 53 km/s) and a 50% (20%) velocity width of 22.8 km/s (31.3 km/s). Furthermore, we measure F_HI = 0.93 Jy km/s, corresponding to an HI mass of 8 × 10⁵ M_☉. We calculate an HI mass-to-light ratio (M_HI / L_B) = 0.22 M_☉/L_☉. The ATCA HI velocity field shows a gradient perpendicular to the stellar disc, similar to that discussed for ESO 349-G031. High resolution ATCA HI images indicate the HI emission is offset from the optical centre, located on both sides of the minor axis. It is unclear if the gas is rotating or being accreted/ejected. If the observed velocity gradient is due to rotation (v_rot = 15 km/s) we calculate M_dyn = 2 × 10⁷ M_☉.

Reference: Koribalski et al. 2018 * LVHIS database * LVHIS homepage * next