AGNs in the Mid-Infrared

Details AGNs in the Mid-Infrared AGNs in the Mid-Infrared

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mas..conf..163s&link_type=abstract

MULTIWAVELENGTH AGN SURVEYS. Proceedings of the Guillermo Haro Conference 2003. Held 8-12 December 2003 in Cozumel, Mexico. Edit

Astronomy and Astrophysics

Astronomy

Scientific paper

This contribution reviews some of the mid-infrared (≈3-50μm) properties of AGNs as deduced recently from ISO-SWS observations of a large number of these types of galaxies. Mid-IR line ratio diagrams are presented, 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. Furthermore, correlations of mid-infrared line fluxes to the mid- and far-infrared continuum are used, in order to examine the contribution of AGNs to the infrared luminosities of their host galaxies. The ratio of mid-infrared AGN continuum luminosity to X-ray luminosity in Seyfert-1 and Seyfert-2 galaxies is presented as one way to test AGN unification theories. Finally, all these new diagnostics are applied to the infrared luminous galaxy NGC 6240, which played an important role at this conference as a prototype of highly obscured AGNs (QSO2s, elusive AGNs).

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