Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.325s&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
Scientific paper
We study the polycyclic aromatic hydrocarbons (PAH) bands, ionic emission lines, and Mid-infrared continuum properties, in a sample of 171 emission line galaxies taken from the literature plus 15 new active galactic nucleus (AGN) Spitzer spectra. The observed intensity ratios for neutral and ionized PAHs (6.2μm/7.7μm × 11.3μm/7.7μm) were compared to theoretical intensity ratios, showing that AGNs have higher ionization fraction and larger PAH molecules (≥ 180 carbon atoms) than SB galaxies. The ratio between the ionized (7.7μm) and the neutral PAH bands (8.6μm and 11.3μm) are distributed over different ranges for AGNs and SB galaxies, suggesting that these ratios could depend on the ionization fraction, as well as on the hardness of the radiation field. The ratio between the 7.7μm and 11.3μm bands is nearly constant with the increase of [Ne III]15.5μm/[Ne II] 12.8μm, indicating that the fraction of ionized to neutral PAH bands does not depend on the hardness of the radiation field. The equivalent width of both PAH features show the same dependence (strongly decreasing) with [Ne III]/[Ne II], suggesting that the PAH molecules, emitting either ionized (7.7μm) or neutral (11.3μm) bands, may be destroyed with the increase of the hardness of the radiation field.
Pastoriza Miriani
Riffel Rogério
Sales Dinalva A.
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