Spitzer/IRS spectroscopy of the 12um Seyferts

Details Spitzer/IRS spectroscopy of the 12um Seyferts Spitzer/IRS spectroscopy of the 12um Seyferts

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348412w&link_type=abstract

American Astronomical Society, AAS Meeting #213, #484.12; Bulletin of the American Astronomical Society, Vol. 41, p.455

Astronomy and Astrophysics

Astronomy

Scientific paper

The extended 12um galaxy sample is a flux-limited sample of 893 galaxies selected from the IRAS Faint Source Catalog 2. A total of 118 objects from this sample have been classified optically as Seyfert galaxies, providing one of the largest infrared selected unbiased sample of active galactic nuclei (AGN). We present our prelimary results from our analysis of mid-infrared Spitzer/IRS spectra of 102 12um Seyferts (that is 86 % of the 12um Seyfert sample) which have been observed by various Spitzer programs and are available in the Spitzer archive. A number of mid-infared diagnostics have been developed to study the nature of nuclear dust enshrouded emission from AGNs, in order to disentangle the starburst-AGN connection. Since PAH emission is a tracer of star formation activity we have measured the 11.3um PAH feature for our Seyfert sample. We find that as the strength of the radiation field in AGNs increases the PAH molecules are destroyed, while the PAH EWs increase with the IRAS f60/f25 ratios of the host galaxies. We further probe this warm/cold color diagnostic, by contrasting our findings with those of we starbust galaxies, ULIRGs, as well as blue compact dwarf galaxies.

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