id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_rp4v7nkgoffezf5pvt73iaorji	N. L. J. Cox	Polycyclic aromatic hydrocarbons and molecular hydrogen in oxygen-rich planetary nebulae: the case of NGC 6720	2015	5	.pdf	application/pdf	4825	426	78	presence of the 11.3 µm aromatic (PAH) emission band. It is attributed to emission from neutral PAHs, since no band is observed in the 7–8 µm range. photochemistry suggests a possible bottom-up scenario for the formation of PAHs. Agúndez, Cernicharo & Goicoechea (2008) have PAH, H2, and dust emission in NGC 6720 (see van Hoof et al. 3.1 PAH emission bands: profile and intensity The integrated line intensities of the 12.0 and 12.7 µm PAH bands in the 'SW' region are Pech, Joblin & Boissel (2002) modelled the emission of a distribution of PAHs in IRAS 21282+5050 suggesting that the extended & Sarre (2015) also modelled the 11.3 µm emission band with neutral PAHs. These authors conclude that a profile with a peak at a We present the unexpected detection of a weak 11.3 µm PAH emission band in the main dust torus of O-rich PN NGC 6720.	./cache/work_rp4v7nkgoffezf5pvt73iaorji.pdf	./txt/work_rp4v7nkgoffezf5pvt73iaorji.txt