Investigation of PAHs in galactic planetary nebulae with the AKARI/IRC and the Spitzer/IRS

Ohsawa, R.; Onaka, T.; Sakon, I.; Mori, T.I.; Yamamura, I.; Matsuura, M.; Kaneda, H.; Bernard-Salas, J.; Berne, O. and Joblin, C. (2012). Investigation of PAHs in galactic planetary nebulae with the AKARI/IRC and the Spitzer/IRS. Publications of The Korean Astronomical Society, 27(4) pp. 259–260.

DOI: https://doi.org/10.5303/PKAS.2012.27.4.259

Abstract

Polycyclic aromatic hydrocarbons (PAHs) in Galactic planetary nebulae (PNe) are investigated by means of the unidentified infrared (UIR) bands. Continuous near- to mid-infrared spectra of PNe are obtained with the AKARI/IRC and the Spitzer/IRS. All 19 PNe in the present study show prominent dust emissions and we investigate the variation in the intensity ratios among the UIR bands. The ionization fraction and the size distribution of PAHs in PNe are derived using the UIR band ratios. We find that the ionization fraction of PAHs in PNe is around 0.0-0.6 and that small PAHs are scarce. The present result indicates a systematic trend of the aliphatic feature to become weak as the PAH ionization fraction increases.

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