| Full text | |
| Author(s): |
Menezes, R. B.
;
Steiner, J. E.
Total Authors: 2
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 466, n. 1, p. 749-761, APR 2017. |
| Web of Science Citations: | 0 |
| Abstract | |
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 GeminiMultiobject 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 Ha 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. (AU) | |
| FAPESP's process: | 12/02268-8 - Galactic nuclei in the local universe: supermassive black holes and stellar archeology of galaxies of high and low masses |
| Grantee: | Roberto Bertoldo Menezes |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 11/51680-6 - Exploring the universe: from the galaxies formation to Earth-like planets with the Giant Magellan Telescope |
| Grantee: | Laerte Sodré Junior |
| Support Opportunities: | Special Projects |