The emission-line regions in the nucleus of NGC 1313 probed with
  GMOS-IFU: a supergiant/hypergiant candidate and a kinematically cold nucleus
  NGC 1313 is a bulgeless nearby galaxy, classified as SB(s)d. Its proximity
allows high spatial resolution observations. We performed the first detailed
analysis of the emission-line properties in the nuclear region of NGC 1313,
using an optical data cube obtained with the Gemini Multi-object Spectrograph.
We detected four main emitting areas, three of them (regions 1, 2 and 3) having
spectra typical of H II regions. Region 1 is located very close to the stellar
nucleus and shows broad spectral features characteristic of Wolf-Rayet stars.
Our analysis revealed the presence of one or two WC4-5 stars in this region,
which is compatible with results obtained by previous studies. Region 4 shows
spectral features (as a strong H$\alpha$ emission line, with a broad component)
typical of a massive emission-line star, such as a luminous blue variable, a
B[e] supergiant or a B hypergiant. The radial velocity map of the ionized gas
shows a pattern consistent with rotation. A significant drop in the values of
the gas velocity dispersion was detected very close to region 1, which suggests
that the young stars there were formed from this cold gas, possibly keeping low
values of velocity dispersion. Therefore, although detailed measurements of the
stellar kinematics were not possible (due to the weak stellar absorption
spectrum of this galaxy), we predict that NGC 1313 may also show a drop in the
values of the stellar velocity dispersion in its nuclear region.
