id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_aaej5rkaobf5bozvyiwvz7xhvy	D. A. Dale	Mid‐Infrared Spectral Diagnostics of Nuclear and Extranuclear Regions in Nearby Galaxies	2006	30	.pdf	application/pdf	9860	1010	76	Mid-infrared diagnostics are presented for a large portion of the Spitzer Infrared Nearby Galaxies Survey (SINGS) sample plus archival data from the Infrared Space Observatory and the Spitzer Space Telescope. low-ionization cooling lines of X-ray dominated regions like [Si II] 34.82 µm can particular show weak PAH and large ratios of high-to-low ionization line emission. The upper panel of Figure 3 uses the 6.2 µm PAH feature and the emission line ratio [O IV]25.89 µm/[Ne II]12.81 µm in a similar mid-infrared diagnostic diagram, [O I]63 µm) has previously been observed emanating from the large "partially-ionized regions" surrounding AGN and infrared-bright galaxies (Veilleux & Osterbrock 1987; Armus, excitation, nearly all of the "pure star-forming" nuclei and extra-nuclear regions show relatively elevated ratios in [S III]33.48 µm/[Si II]34.82 µm (see also Figure 3). AGN and star-forming sources in dusty ULIRGs is that mid-infrared lines and PAH features	./cache/work_aaej5rkaobf5bozvyiwvz7xhvy.pdf	./txt/work_aaej5rkaobf5bozvyiwvz7xhvy.txt