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
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