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Near-infrared PAH features in galactic planetary nebulae

Ohsawa, R., Onaka, O., Sakon, I., Mori, T. I. and Matsuura, M. ORCID: 2017. Near-infrared PAH features in galactic planetary nebulae. Publications of The Korean Astronomical Society 32 (1) , pp. 87-91. 10.5303/pkas.2017.32.1.087

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Polycyclic aromatic hydrocarbons (PAHs) are considered to be carriers of the unidentified infrared bands, which are ubiquitously observed in the Universe. PAHs are mainly formed around evolved carbon-rich stars and injected into interstellar space. Planetary nebulae (PNe), a late stage of low- and intermediate stellar mass evolution, are suitable objects to investigate the formation and evolution of PAHs. The shortest PAH feature is located in $3.3{\mu}m$, which is important to examine the excitation and size distribution of PAHs. While the number of samples had been limited before, the high sensitivity of AKARI /IRC has drastically increased the number of samples. We obtained the $2-5{\mu}m$ spectra of Galactic PNe with AKARI /IRC and compiled a near-infrared spectral catalog, containing 73 PNe. We investigate the detection rate and the evolution of the PAH features. The characteristics of the catalog are illustrated and the origin of the evolution of the PAH features is discussed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
ISSN: 1225-1534
Date of Acceptance: 21 October 2016
Last Modified: 14 May 2024 15:31

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