An IRS spectral search for clumps in AGN tori

Details An IRS spectral search for clumps in AGN tori An IRS spectral search for clumps in AGN tori

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50375l&link_type=abstract

Spitzer Proposal ID #50375

Computer Science

Scientific paper

The dusty torus which is thought to hide the AGN in Seyfert-2 galaxies from our view has long been thought to be clumpy. Some objects show appearance and disappearance of broad lines in the optical, and nearly all Compton thin Seyfert-2s that have been studied show variable X-ray columns. We wish to investigate whether this variability extends to the column density of dust in the mid-infrared. In particular, the silicate and ice features in the spectra of Seyfert-2 galaxies should show measurable variability if the variable gas columns seen in the X-ray also contain dust. We wish to search for infrared spectral variability in a sample of eight nearby Seyfert 1.8-2 galaxies which are known to have highly-variable X-ray columns on timescales of months. These objects have all been observed previously with Spitzer, giving us a temporal baseline of 3-5 years. If variability is seen, we will be able to constrain the size of the clumps, and place them in the outer torus. If no variability is seen, it would suggest that the X-ray absorbing gas is in the inner torus or broad-line region.

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