Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..408..203r&link_type=abstract
The Starburst-AGN Connection. ASP Conference Series, Vol. 408, proceedings of the conference held 27-31 October 2008, at Shangha
Astronomy and Astrophysics
Astronomy
Scientific paper
We report results of an ongoing work aimed at developing robust diagnostics for the presence of hidden starburst in active galactic nuclei (AGN) by means of both the underlying near-infrared (NIR) continuum and the line emission spectrum. We found that the 1.1 μm CN absorption band can be taken as unambiguous evidence of young/intermediate stellar populations (SPs). This is confirmed by the analysis of the SPs in four starburst galaxies displaying prominent CN absorption. The spectra are best explained by stellar templates containing a sizable amount (20% to 56% by mass) of 1~Gyr old stars at the Thermally Pulsing-Asymptotic Giant Branch phase. Diagnostic diagrams involving emission line ratios in the NIR were also tested with the goal of separating objects according to the level of nuclear activity. [Fe II] 1.257μm/Paβ vs H_2 2.121μm/Brγ and [S III] 0.953μm/Paβ vs He I 1.083μm/Paβ successfully separate starbursts from AGNs and LINERs. They are proposed as useful tools to find out hidden starburst activity.
Carvalho E. A.
Maraston Claudia
Pastoriza Miriani Griselda
Riffel Rogério
Rodriguez-Ardila Alberto
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