The Distribution of Silicate Strength of AGNs and ULIRGs

Details The Distribution of Silicate Strength of AGNs and ULIRGs The Distribution of Silicate Strength of AGNs and ULIRGs

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..373..574h&link_type=abstract

The Central Engine of Active Galactic Nuclei, ASP Conference Series, Vol. 373, proceedings of the conference held 16-21 October,

Computer Science

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Scientific paper

A sample of 196 AGNs and ULIRGs observed by the Infrared Spectrograph (IRS) on Spitzer is analyzed to study the distribution of the strength of the 9.7 micron silicate feature. Average spectra are derived for quasars, Seyfert 1 and Seyfert 2 AGNs, and ULIRGs. We find that quasars, Seyfert 2s and ULIRGs are characterized by silicate features in emission, weak absorption, and strong absorption, respectively, and Seyfert 1s equally by emission or weak absorption. The distributions of their spectral characteristics and luminosities are compared to those of optically faint infrared sources at z ˜ 2 being discovered by the IRS. It is found that local ULIRGs are a similar population, with lower luminosities and somewhat stronger absorption. Refer to tet{hao_etal_07} for more complete results.

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