The Local Volume HI Survey (LVHIS)

UGCA 365

UGCA 365 (HIPASS J1336-29) is a dwarf irregular galaxy located 38.4 arcmin from the spiral galaxy M 83, just north of its extended HI envelope. Its TRGB distance is 5.25 ± 0.43 Mpc (Karachentsev et al. 2007), similar to that of M 83 within the given uncertainty. UGCA 365 has an optical size of 1.2 arcmin × 0.5 arcmin (PA = 31 degr) and a B-band magnitude of 15.43 mag. Our low-resolution ATCA HI data of UGCA 365 show an unresolved source; at higher resolution a velocity pattern along the optical major axis is detected. We measure FHI = 2.9 Jy km/s and derive MHI = 1.9 × 107 M. Both the stellar and the gas distribution show some extent to the south-east along the galaxy minor axis, possibly due to the tidal interaction with M 83. Using an inclination-corrected (i = 66 degr) rotational velocity of 50 km/s we calculate a total dynamical mass of ~1.2 × 109 M for UGCA 365. The tidal limit at the position of UGCA 365, 38.4 arcmin (50 kpc) from the centre of M 83, is ~5 kpc. Begum et al. (2008) observed UGCA 365 as part of the FIGGS project. They measure an HI diameter of 0.9 arcmin (~1.7 × the optical diameter) and an HI flux density of FHI = 2.3 ± 0.2 Jy km/s. Their HI map hints at an extension towards the north-west.

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

Last updated on 18 Feb 2018. © Copyright CSIRO