%0 Journal Article
%T Mid-J CO Emission in Nearby Seyfert Galaxies
%A M. Pereira-Santaella
%A L. Spinoglio
%A G. Busquet
%A J. Glenn
%A K. Isaak
%A J. Kamenetzky
%A N. Rangwala
%A M. R. P. Schirm
%A M. Baes
%A M. J. Barlow
%A A. Boselli
%A A. Cooray
%A D. Cormier
%J Physics
%D 2013
%I arXiv
%X We study for the first time the complete sub-millimeter spectra (450 GHz to 1550 GHz) of a sample of nearby active galaxies observed with the SPIRE Fourier Transform Spectrometer (SPIRE/FTS) onboard Herschel. The CO ladder (from Jup = 4 to 12) is the most prominent spectral feature in this range. These CO lines probe warm molecular gas that can be heated by ultraviolet photons, shocks, or X-rays originated in the active galactic nucleus or in young star-forming regions. In these proceedings we investigate the physical origin of the CO emission using the averaged CO spectral line energy distribution (SLED) of six Seyfert galaxies. We use a radiative transfer model assuming an isothermal homogeneous medium to estimate the molecular gas conditions. We also compare this CO SLED with the predictions of photon and X-ray dominated region (PDR and XDR) models.
%U http://arxiv.org/abs/1301.3365v1