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- W3105264780 abstract "We present $Spitzer$/IRS mid-infrared spectral maps of the Galactic star-forming region M17 as well as IRSF/SIRIUS Br$gamma$ and Nobeyama 45-m/FOREST $^{13}$CO ($J$=1--0) maps. The spectra show prominent features due to polycyclic aromatic hydrocarbons (PAHs) at wavelengths of 6.2, 7.7, 8.6, 11.3, 12.0, 12.7, 13.5, and 14.2 $mu$m. We find that the PAH emission features are bright in the region between the HII region traced by Br$gamma$ and the molecular cloud traced by $^{13}$CO, supporting that the PAH emission originates mostly from photo-dissociation regions. Based on the spatially-resolved $Spitzer$/IRS maps, we examine spatial variations of the PAH properties in detail. As a result, we find that the interband ratio of PAH 7.7 $mu$m/PAH 11.3 $mu$m varies locally near M17SW, but rather independently of the distance from the OB stars in M17, suggesting that the degree of PAH ionization is mainly controlled by local conditions rather than the global UV environments determined by the OB stars in M17. We also find that the interband ratios of the PAH 12.0 $mu$m, 12.7 $mu$m, 13.5 $mu$m, and 14.2 $mu$m features to the PAH 11.3 $mu$m feature are high near the M17 center, which suggests structural changes of PAHs through processing due to intense UV radiation, producing abundant edgy irregular PAHs near the M17 center." @default.
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- W3105264780 date "2016-12-15" @default.
- W3105264780 modified "2023-10-18" @default.
- W3105264780 title "SPATIAL VARIATIONS OF PAH PROPERTIES IN M17SW REVEALED BYSPITZER/IRS SPECTRAL MAPPING" @default.
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- W3105264780 doi "https://doi.org/10.3847/1538-4357/833/2/163" @default.
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