Repositório Digital

A- A A+

The CaT strength in Seyfert nuclei revisited : analysing young stars and non-stellar light contributions to the spectra

.

The CaT strength in Seyfert nuclei revisited : analysing young stars and non-stellar light contributions to the spectra

Mostrar registro completo

Estatísticas

Título The CaT strength in Seyfert nuclei revisited : analysing young stars and non-stellar light contributions to the spectra
Autor Neme, Luis Rodolfo Vega
Asari, Natalia Vale
Fernandes Junior, Roberto Cid
Garcia-Rissmann, Aurea
Storchi-Bergmann, Thaisa
González Delgado, Rosa M.
Schmitt, Henrique Roberto
Abstract In a former paper, we have presented spectra of 64 active, nine normal and five starburst galaxies in the region around the near-infrared calcium triplet (CaT) absorption lines and the [S III]λ9069 line. In the present paper, we analyse the CaT strength (WCaT) and kinematical products derived in that study, namely stellar (σ) and ionized gas (σgas) velocity dispersions. Our main results may be summarized as follows. (1) Type 2 Seyfert galaxies show no sign of dilution in WCaT with respect to the values spanned by normal galaxies, even when optical absorption lines such as the Ca II K band at 3933 Å are much weaker than in old, bulge-like stellar populations. (2) The location of type 2 Seyfert galaxies in the WCaT–WCaK plane is consistent with evolutionary synthesis models. The implication is that the source responsible for the dilution of optical lines in these active galactic nuclei (AGN) is a young stellar population, rather than an AGN featureless continuum, confirming the conclusion of the pioneer study of Terlevich, Díaz & Terlevich. (3) In type 1 Seyfert galaxies, both W[S III] and WCaT tend to be diluted due to the presence of a non-stellar component, in agreement with the unification paradigm. (4) A comparison of σ with σgas (obtained from the core of the [S III] emitting line) confirms the existence of a correlation between the typical velocities of stars and clouds of the narrow line region. The strength and scatter around this correlation are similar to those previously obtained from the [O III]λ5007 linewidth.
Contido em Monthly notices of the royal astronomical society. Oxford. Vol. 393, no. 3 (Mar. 2009), p. 846-857
Assunto Galaxias elipticas
Galaxias seyfert
Nucleo galatico
Populacoes estelares
[en] Galaxies: kinematics and dynamics
[en] Galaxies: nuclei
[en] Galaxies: stellar content
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/90449
Arquivos Descrição Formato
000702963.pdf (934.5Kb) Texto completo (inglês) Adobe PDF Visualizar/abrir

Este item está licenciado na Creative Commons License

Este item aparece na(s) seguinte(s) coleção(ões)


Mostrar registro completo

Percorrer



  • O autor é titular dos direitos autorais dos documentos disponíveis neste repositório e é vedada, nos termos da lei, a comercialização de qualquer espécie sem sua autorização prévia.
    Projeto gráfico elaborado pelo Caixola - Clube de Criação Fabico/UFRGS Powered by DSpace software, Version 1.8.1.