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The Effect of Active Galactic Nuclei on the Mid-Infrared Aromatic Features | | Aleksandar M. Diamond-Stanic
; George H. Rieke
; | | Date: |
14 Sep 2010 | | Abstract: | We present Spitzer measurements of the aromatic (also known as PAH) features
for 35 Seyfert galaxies from the revised Shapley-Ames sample and find that the
relative strengths of the features differ significantly from those observed in
star-forming galaxies. Specifically, the features at 6.2, 7.7, and 8.6 micron
are suppressed relative to the 11.3 micron feature in Seyferts. Furthermore, we
find an anti-correlation between the L(7.7 micron)/L(11.3 micron) ratio and the
strength of the rotational H2 (molecular hydrogen) emission, which traces
shocked gas. This suggests that shocks suppress the short-wavelength features
by modifying the structure of the aromatic molecules or destroying the smallest
grains. Most Seyfert nuclei fall on the relationship between aromatic emission
and [Ne II] emission for star-forming galaxies, indicating that aromatic-based
estimates of the star-formation rate in AGN host galaxies are generally
reasonable. For the outliers from this relationship, which have small L(7.7
micron)/L(11.3 micron) ratios and strong H2 emission, the 11.3 micron feature
still provides a valid measure of the star-formation rate. | | Source: | arXiv, 1009.2752 | | Services: | Forum | Review | PDF | Favorites | |
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