id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_h5abgqoeuzcabcwj4yg7oidoie	Gregory Brunner	Warm Molecular Gas in M51: Mapping the Excitation Temperature and Mass of H2with theSpitzerInfrared Spectrograph	2008	14	.pdf	application/pdf	8647	681	78	We have mapped the warm molecular gas traced by the H2 S(0)–H2 S(5) pure rotational mid-infrared emission lines surface density distributions by assuming a two-temperature model: a warm (T ¼ 100 300 K) phase traced by the low The warm H2 is found in the dust lanes of M51 and is generally spatially coincident with the cold molecular gas traced by CO emission, consistent with excitation of the warm phase in dense photodissociation regions. Fig. 4.—Excitation diagrams and the fits to the warm and hot H2 phases taken from three different single-pixel regions along the M51 strip. The highest gas surface density for the warm H2 phase is in the inner northwest spiral arm at 11 M� pc Figure 8 compares the warm (in gray scale) and hot (in contours) H2 surface density distributions. The warm H2 mass distribution peaks in the northwest inner spiral arm and the hot H2	./cache/work_h5abgqoeuzcabcwj4yg7oidoie.pdf	./txt/work_h5abgqoeuzcabcwj4yg7oidoie.txt