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Date and Time of the Query: 2019-05-19 T07:54:40 PDT
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For refcode 2009MNRAS.393..846V:
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Copyright by Royal Astronomical Society. 2009MNRAS.393..846V The CaT strength in Seyfert nuclei revisited: analysing young stars and non-stellar light contributions to the spectra Vega, L. R.; Asari, N. V.; Cid Fernandes, R.; Garcia-Rissmann, A.; Storchi-Bergmann, T.; Gonzalez Delgado, R. M.; Schmitt, H. 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 [SIII]{lambda}9069 line. In the present paper, we analyse the CaT strength (W_CaT_) and kinematical products derived in that study, namely stellar ({sigma}_*_) and ionized gas ({sigma}_gas_) velocity dispersions. Our main results may be summarized as follows. (1) Type 2 Seyfert galaxies show no sign of dilution in W_CaT_ with respect to the values spanned by normal galaxies, even when optical absorption lines such as the CaII K band at 3933 Angstrom are much weaker than in old, bulge-like stellar populations. (2) The location of type 2 Seyfert galaxies in the W_CaT_-W_CaK_ 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, Diaz & Terlevich. (3) In type 1 Seyfert galaxies, both W_[SIII]_ and W_CaT_ tend to be diluted due to the presence of a non-stellar component, in agreement with the unification paradigm. (4) A comparison of {sigma}_*_ with {sigma}_gas_ (obtained from the core of the [SIII] 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 [OIII]{lambda}5007 linewidth. Key words: galaxies: kinematics and dynamics, galaxies: nuclei, galaxies: Seyfert, galaxies: stellar content
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