| Texto completo | |
| Autor(es): |
Freitas-Lemes, P.
;
Krabbe, A. C.
;
Faundez-Abans, M.
;
da Rocha-Poppe, P.
;
Rodrigues, I.
;
de Oliveira-Abans, M.
;
Fernandes-Martin, V. A.
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 468, n. 3, p. 3159-3165, JUL 2017. |
| Citações Web of Science: | 1 |
| Resumo | |
We present an observational study of the galaxy HRG 54103, a peculiar galaxy with an asymmetric disc ring. The main goal of this work is to study the stellar population and oxygen abundances for the inner bulge region. The kinematics derived from long-slit spectroscopy suggest that the line of nodes of the gaseous component of HRG 54103 is nearly along the galaxy ring minor axis. The gaseous disc seems to be kinematically decoupled relative to the morphology of the stellar ring. A small, but non-negligible, fraction of young stars (5-10 per cent) is estimated to contribute. This object is mainly dominated by old and intermediate stellar populations. The emission-line spectrum shows low-ionization nuclear emission-line region (LINER) type characteristics. We determined oxygen abundances using calibrations between this parameter and the strong emission line ratios known as the indices O3N2 and N2. Our results suggest a relatively homogeneous O/H across the minor axis of the galaxy, with average values of 12 + log(O/H)=8.4 dex and 12 + log(O/H)=8.7 dex, using the O3N2 and N2 parameters, respectively. These values are compatible with the few estimations of oxygen abundance for peculiar ring galaxies published in the literature. Implications on the formation history of HRG 54103 were investigated. (AU) | |
| Processo FAPESP: | 13/17247-9 - Dinâmica de galáxias discoidais isoladas e em interação via simulações de N-Corpos/SPH |
| Beneficiário: | Irapuan Rodrigues de Oliveira Filho |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 10/01490-3 - Galáxias em interação: efeitos na população estelar e nas propriedades físicas do gás ionizado |
| Beneficiário: | Angela Cristina Krabbe |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |