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Spitzer IRS observations of k+a galaxies: A link between PAH emission properties and AGN feedback?

We have performed IRS low resolution 5-12 micron spectroscopy on a sample of galaxies selected to be at 3 distinct post-starburst evolutionary stages based on their optical spectral indices. The resulting IRS spectra show distinctive PAH emission line structures at 6.2, 7.7, 8.6 and 11.3 micron and little silicate absorption, indicative of ongoing star formation. However the PAH inter-line ratios, in particular the 11.3/6.2 micron and 7.7/6.2 micron ratio, show large variations. These variations are found to correlate with both time since the most recent starburst and AGN activity. We speculate that the evolution observed in these PAH ratios is related to an increase in AGN activity with time since star burst.

preprint2009arXivOpen access
I. G. RoseboomS. OliverD. Farrah
astro-ph.CO
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Open access3 authors1 topic
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I. G. RoseboomS. OliverD. Farrah

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