id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_3qc2b2xwbbhdtnbokqkxbzldi4	J A Toalá	Hidden IR structures in NGC 40: signpost of an ancient born-again event	2019	10	.pdf	application/pdf	7234	694	75	We present the analysis of infrared (IR) observations of the planetary nebula NGC 40 together shows the presence of a toroidal structure mainly seen in PAH emission, but also detected structures inside the main cavity of NGC 40 close to the central To supplement the Spitzer spectral maps of NGC 40, we also analysed Spitzer IRAC and Herschel PACS observations. the different PAHs and low-ionization emission lines detected in low-ionization species and broad emission features of PAHs (see The spatial distribution of the emission in the PAH spectral maps and the PAHs features, we present colour-composite images combining different spectral maps in the top panels of Fig. 5. The top panels present colour-composite pictures of NGC 40 combining different spectral images. Herschel 70 μm image has been chosen to enhance the structures inside the main cavity in NGC 40. The main IR spectral features are emission lines from	./cache/work_3qc2b2xwbbhdtnbokqkxbzldi4.pdf	./txt/work_3qc2b2xwbbhdtnbokqkxbzldi4.txt