Little or no star formation in the central 30 pc of Seyfert 2s from STIS observations

Details Little or no star formation in the central 30 pc of Seyfert 2s from STIS observations Little or no star formation in the central 30 pc of Seyfert 2s from STIS observations

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sacm.confe...7s&link_type=abstract

The Starburst-AGN Connection under the Multiwavelength Limelight, held 14-16 September 2011. Published online at http://www.scio

Computer Science

Scientific paper

We present a study of the stellar populations in the central parsecs of a sample of 22 Seyfert 2 galaxies, based on a careful separation of nebular emission and stellar light in high-spatial resolution HST-STIS spectra. 14% of the surveyed nuclei display stellar populations of intermediate age, ~1-2~Gyr old, whereas the remaining targets appear to be evenly split between objects showing only very old stellar populations and nuclei requiring also an additional blue featureless component, which we initially characterise by means of very young, few-Myr-old stars. The small fraction of stellar population of intermediate age seems to argue against the presence of such a young component, however, since the short lifetime of O-stars would imply recurrent star-formation episodes and the build-up over the last 1-2~Gyr of a detectable intermediate-age population. Additionally, the doing of correlations between the luminosity of such a blue component and the strength of the nebular emission from highly-ionised species or broad-line regions, together with the general absence of Wolf-Rayet features, further indicate that the featureless continuum arises generally from the central engine rather than from star-forming regions. We discuss our results in the framework of the unification paradigm and of models for star formation close to supermassive black holes.

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