New mid-infrared line diagnostics for dusty galaxies and the Starburst-AGN connection

Details New mid-infrared line diagnostics for dusty galaxies and the Starburst-AGN connection New mid-infrared line diagnostics for dusty galaxies and the Starburst-AGN connection

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4806s&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #48.06; Bulletin of the American Astronomical Society, Vol. 34, p.1180

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We have analysed mid-infrared ISO-SWS spectra of a sample of 29 galaxies with active nuclei. This data set is rich in fine structure emission lines tracing the narrow line regions and (circum-)nuclear star formation regions, and it provides a coherent spectroscopic reference for future extragalactic studies in the mid-infrared (e.g. with SIRTF or SOFIA). Based on this data set we have developed new tools to determine the properties of dusty galaxies and to study the AGN-starburst connection. Here we present new mid-IR line ratio diagrams which can be used to identify composite (starburst + AGN) sources and to distinguish between emission excited by active nuclei and emission from (circum-nuclear) star forming regions. In addition, we present two-dimensional diagnostic diagrams that are fully analogous to classical optical diagnostic diagrams, but better suited for objects with high extinction. Finally, we discuss correlations of mid-infrared line fluxes to the mid- and far-infrared continuum. We compare these relations to similar relations in starburst galaxies in order to examine the contribution of AGNs to the bolometric luminosities of their host galaxies.

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