The 15-20 um PAH emission

Details The 15-20 um PAH emission The 15-20 um PAH emission

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50713p&link_type=abstract

Spitzer Proposal ID #50713

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Scientific paper

Spitzer has discovered emission features between 15 - 20 um that are considered new members of the PAH emission band family. These observations clearly indicate that this emission is comprised of at least two classes of independent components: distinct, narrow features and broad variable plateaus. These two components seem to be related with object type. Within the extended star forming region Orion both the broad plateau and the complex of narrow features are observed, suggesting that either the carrier of the broad plateau is more stable against UV photons than the carrier of the distinct narrow features (e.g. larger size) or the ionization state of the carrier of both features is different. In other objects, such as NGC2023, the relative intensities of the narrow features seem to vary with distance from the exciting star. Here, we propose to obtain SH spectral maps of 3 well-studied HII regions to investigate variations and similarities in the 15-20 um PAH emission as a function of position across the HII region and immediate surroundings. These data will be compared to our previous data of the distribution of the shorter wavelength main PAH features, the continuum dust emission and the emission of the ionized gas. The 15 to 20 um features will be analyzed using the Ames PAH IR spectral database, permitting characterization of the long wavelength PAH features. Combined, these results will paint a more detailed picture of characteristics of the carrier of the long wavelength PAH emission.

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