| Texto completo | |
| Autor(es): |
Menezes, R. B.
;
Steiner, J. E.
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 466, n. 1, p. 749-761, APR 2017. |
| Citações Web of Science: | 0 |
| Resumo | |
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) | |
| Processo FAPESP: | 12/02268-8 - Núcleos de galáxias no universo local: buracos negros supermassivos e arqueologia estelar de galáxias de alta e baixa massas |
| Beneficiário: | Roberto Bertoldo Menezes |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 11/51680-6 - Explorando o universo: da formação de galáxias aos planetas tipo-Terra, com o Telescópio Gigante Magellan |
| Beneficiário: | Laerte Sodré Junior |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |