Analyzing astronomical observations with the NASA Ames PAH database.

Details Analyzing astronomical observations with the NASA Ames PAH database. Analyzing astronomical observations with the NASA Ames PAH database.

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.112c&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We use the NASA Ames spectroscopic database of infrared properties of Polycyclic Aromatic Hydrocarbon (PAH) molecules to model the infrared emission of PAHs following absorption of UV photons. We calculate emission spectra resulting from the full cooling cascade for each species in the database. Using a least squares approach, we determine what type of PAH mixtures best reproduce typical astronomical observations representing the different classes of UIR spectra. We find that we can reproduce the observed UIR spectra in the wavelength range 6-14 μm, offering support for the hypothesis that the UIR bands are indeed due to vibrational modes of PAHs and related molecular species. Spectral decompositions of our best fit models confirm and reinforce several earlier results: (i) the 6.2 μm band requires a significant contribution of nitrogen-substituted PAHs (PANHs); (ii) the reported components and their variations in the 7.7 μm band are indicative of changes in the size distribution of the contributing molecules; (iii) there is a significant contribution of anions to the 7.7 μm band; (iv) the 11.2 μm band is due to large, neutral and pure PAHs; (v) the 11.0 μm band is due to large PAH cations.

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