Probing Parsec Scale Structure of Nearby Seyferts Using Variability

Details Probing Parsec Scale Structure of Nearby Seyferts Using Variability Probing Parsec Scale Structure of Nearby Seyferts Using Variability

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30572g&link_type=abstract

Spitzer Proposal ID #30572

Physics

Scientific paper

Variability is one of the most powerful tools for studying the structure of unresolved objects. To search for mid-IR AGN variability, we propose to re-observe 42 nearby Seyfert galaxies with all IRS modules and MIPS at 24 microns. The sample was originally observed as part of a GTO program and covers a wide range of X-ray determined Hydrogen column density, and because the sources are so bright, very high signal to noise data was obtained in short exposures: 60s for the low resolution IRS mode, 120s for the high resolution IRS mode, and 92 seconds for the MIPS 24 micron imaging mode. This second epoch, which spans 1 to 3 years since the original observations, should allow for variability to be detected in the silicate emission features, the dust continuum, and the gas phase emission lines. Based on models of the dusty torus, the variable mid-IR emission should be occurring on parsec and sub-parsec scales, thus giving information about the dust distribution on those scales..

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