The Local Volume HI Survey (LVHIS)

NGC 5408

NGC 5408 (HIPASS J1403-41) is a barred Magellanic irregular galaxy (type IB(s)m) in the Cen A group, located at a distance of 4.81 ± 0.48 Mpc (Karachentsev et al. 2002). Its closest neighbours are ESO 325-G?011 (HIPASS J1345-41), HIPASS J1348-37, and NGC 5237 (HIPASS J1337-42) at projected distances of 207.7 arcmin, 264.5 arcmin, and 299.1 arcmin, respectively. Our ATCA data show a well-resolved, fairly asymmetric HI distribution with a reasonably regular velocity field. The galaxy's south-western side shows peculiar motions and relatively high velocity dispersion. The disturbed appearance, studied in detail by van Eymeren et al. (2010), could be due to gas outflows and/or accretion. The total HI extent of NGC 5408 is about 10.0 arcmin × 6.3 arcmin (PA = 302 degr), four times larger than its optical size. Van Eymeren et al. (2010) also studied the distribution and kinematics of the ionized gas using Hα images and spectra, revealing a diffuse filamentary structure similar to IC 4662. NGC 5408 is a well-studied galaxy, mainly because of its ultra-luminous X-ray source, possibly an intermediate mass black hole. Strong 20-cm radio continuum emission is associated with the bright HII region detected by van Eymeren et al. (2010).

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

Last updated on 18 Feb 2018. © Copyright CSIRO