Seyfert Galaxies in the Local Universe: Analysis of Spitzer Spectra of a Complete Sample
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Seyfert Galaxies in the Local Universe: Analysis of Spitzer Spectra of a Complete Sample

  • Author(s): Tommasin, S
  • Spinoglio, L
  • Hainline, K
  • Malkan, MA
  • Smith, H
  • et al.
Abstract

The Spitzer high resolution spectra of 72 Seyfert galaxies from the 12$\mu$m Galaxy Sample are presented and discussed. The presence of starburst components in these galaxies can be quantified by powerful mid-IR diagnostics tools (i.e. 11.25$\mu$m PAH feature equivalent width and the H$_2$ emission line intensity), as well as the AGN dominance can be measured by specific fine structure line ratios (e.g. [NeV]/[NeII], [NeV]/[SiII], etc.). The two types of Seyfert galaxies do not show any statistical difference in our diagnostic tools. However, the Seyfert 2's showing hidden Broad Line Regions in spectro-polarimetric observations have on average an higher AGN dominance, a weaker star formation component and a warmer [60 - 25] spectral index than those without broad emission lines.

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