scholarly journals A self-consistent model of Galactic stellar and dust infrared emission and the abundance of polycyclic aromatic hydrocarbons

2012 ◽  
Vol 545 ◽  
pp. A39 ◽  
Author(s):  
T.P. Robitaille ◽  
E. Churchwell ◽  
R.A. Benjamin ◽  
B.A. Whitney ◽  
K. Wood ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Infrared Emission ◽  
Consistent Model ◽  
Self Consistent ◽  
Polycyclic Aromatic

scholarly journals The Infrared Emission Features and Polycyclic Aromatic Hydrocarbons

1989 ◽  
Vol 135 ◽  
pp. 129-140
Author(s):  
L. J. Allamandola
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Related Species ◽  
Infrared Emission ◽  
Polycyclic Aromatic

The infrared evidence which supports the PAH hypothesis is briefly summarized. Rather than presenting a general discussion of these assignments, this paper focuses on the spectroscopic issues raised by recent observational and experimental developments. These issues include: the position and profile of the “1310” cm−1(“7.7” μm) feature, the position and intensities of the bands in the 910-710 cm−1(11-14 μm) region, the newly detected 1900 cm−1(5.3 μm) band, and the spatial and spectral variations in the 3000 cm−1(3 μm) region as well as in the 12 and 25 μm IRAS bands. It is concluded that the infrared evidence for interstellar PAHs and PAH-related species is compelling.

scholarly journals Processing of polycyclic aromatic hydrocarbons in evolved planetary nebulae

2011 ◽  
Vol 7 (S283) ◽  
pp. 462-463
Author(s):  
Ryou Ohsawa ◽  
Takashi Onaka ◽  
Itsuki Sakon ◽  
Issei Yamamura ◽  
Mikako Matsuura ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Near Infrared ◽  
Planetary Nebulae ◽  
Infrared Emission ◽  
Chemical Processing ◽  
Evolutionary Phase ◽  
Polycyclic Aromatic ◽  
Stellar Temperatures ◽  
Evolution Sequence

AbstractWe investigate the infrared emission bands from Polycyclic Aromatic Hydrocarbons (PAHs) in Galactic planetary nebulae (PNe). PAHs in PNe are assumed to be in transition from circumstellar to interstellar PAHs. We select 15 evolved PNe taking account of effective stellar temperatures and obtain infrared spectra of PNe from AKARI (2.5–5 μm) and Spitzer (5–14 μm) observations. Their evolutionary phase is estimated using [SIV]10.51/[NeII]12.81. We find that the near-infrared PAH bands are significantly enhanced along with stellar evolution sequence. We also find that the ratio of 3.4 to 3.3 μm bands is enhanced. The enhancement might indicate some chemical processing, such as hydrogenation, on small PAHs.

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