Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21713206s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #132.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
We used narrow band 3 micron emission maps of the Orion Bar, M17 and S-106 to investigate the distribution of 3.3 micron polycyclic aromatic hydrocarbon (PAH) emission with respect to K-band emission. In each HII region the prominent 3.3 micron emission was offset from or displayed a different morphology than the K band emission. In the Orion Bar PAH emission was offset by 2-3 arcseconds, in M17 the 3 micron emission exhibited distinctly shell-like morphology, and in S-106 PAH emission was bar-like in distribution. We also obtained 3-5 micron spectra of the regions with prominent 3 micron emission within each HII region using NIRSPEC at Keck Observatory. By systematically stepping the NIRSPEC slit across the regions’ extent we obtained data cubes with 2 spatial and 1 spectral dimension. Spectra at each spatial position were fitted with a series of Gaussians to measure the central wavelength, FWHM and total flux of each feature. Spatial distribution and spectral variation of the 3.3 micron hydrocarbon emission feature and its associated features at 3.4, 3.46, 3.51 and 3.56 microns were examined and compared to HeII , Pfund-gamma and Pfund-delta (Hydrogen) atomic emission. Hydrocarbon emission exhibited the same morphological variations as seen in the narrow band images. While the distribution of individual hydrocarbon features was similar, there were correlations observed between the 3.4 and 3.51 micron emission features as well as spectral variations in the 3.4 micron feature shape between the ionized and molecular regions in the Orion Bar.
McLean Ian S.
Smith Erin C.
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