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2004MNRAS.355..273C - Mon. Not. R. Astron. Soc., 355, 273-296 (2004/November-3)
The star formation history of Seyfert 2 nuclei.
CID FERNANDES R., GU Q., MELNICK J., TERLEVICH E., TERLEVICH R., KUNTH D., LACERDA R.R. and JOGUET B.
Abstract (from CDS):
We find the following. (1) The star formation history of Seyfert 2 nuclei is remarkably heterogeneous: young starbursts, intermediate-age and old stellar populations all appear in significant and widely varying proportions. (2) A significant fraction of the nuclei show a strong FC component, but this FC is not always an indication of a hidden AGN: it can also betray the presence of a young, dusty starburst. (3) We detect weak broad Hβ emission in several Seyfert 2s after cleaning the observed spectrum by subtracting the synthesis model. These are most likely the weak scattered lines from the hidden broad-line region envisaged in the unified model, given that in most of these cases independent spectropolarimetry data find a hidden Seyfert 1. (4) The FC strengths obtained by the spectral decomposition are substantially larger for the Seyfert 2s which present evidence of broad lines, implying that the scattered non-stellar continuum is also detected. (5) There is no correlation between the star formation in the nucleus and either the central or overall morphology of the parent galaxies.
Abstract Copyright: 2004 RAS
Journal keyword(s): galaxies: active - galaxies: Seyfert - galaxies: statistics - galaxies: stellar content
Simbad objects: 83
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