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- W2034173930 abstract "The massive star-forming region W49A represents one of the largest complexes of massive star formation present in the Milky Way and contains at least 50 young massive stars still enshrouded in their natal molecular cloud. We employ Spitzer/Infrared Spectrometer spectral mapping observations of the northern part of W49A to investigate the mid-infrared (MIR) spatial appearance of the polycyclic aromatic hydrocarbon (PAH) bands, PAH plateau features, atomic lines, and continuum emission. We examine the spatial variations of the MIR emission components in slices through two of the ultra-compact-H ii (UC-H ii) regions. We find that the PAH bands reproduce known trends, with the caveat that the 6.2 μm PAH band seems to decouple from the other ionized PAH bands in some of the UC-H ii regions—an effect previously observed only in one other object: the giant star forming region N66 in the Large Magellanic Cloud. Furthermore, we compare the nature of the emission surrounding W49A to that of diffuse sightlines. It is found that the surrounding emission can be explained by line of sight emission and does not represent true diffuse material. Additionally, we examine the MIR appearance of star formation on various scales from UC-H ii regions to starburst galaxies, including a discussion of the fraction of PAH emission in the 8 μm IRAC filter. We find that the MIR appearance of W49A is that of a starburst on large scales, yet its individual components are consistent with other galactic H ii regions." @default.
- W2034173930 created "2016-06-24" @default.
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- W2034173930 date "2014-08-01" @default.
- W2034173930 modified "2023-09-27" @default.
- W2034173930 title "THE MID-INFRARED APPEARANCE OF THE GALACTIC MINI-STARBURST W49A" @default.
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- W2034173930 doi "https://doi.org/10.1088/0004-637x/791/2/99" @default.
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