Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21330502s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #305.02; Bulletin of the American Astronomical Society, Vol. 41, p.274
Astronomy and Astrophysics
Astronomy
Scientific paper
We have obtained moderate resolution (R 2000) spatially-resolved spectroscopy of NGC 7027 and the Orion Bar in order to investigate the spatial evolution of the 3.3 micron polycyclic aromatic hydrocarbon (PAH) emission band and its associated bands at 3.4, 3.46, 3.51, and 3.56 microns. These observations were performed at the Keck Observatory with the NIRSPEC instrument by systematically stepping the entrance slit across the extended, obtaining 3.0-3.8 micron spectra at each position. This procedure creates a data cube for each object with two spatial dimensions and one 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 spatial variation of hydrocarbon features was examined and compared to that of HeII, Pfund delta and Pfund gamma atomic emission. We find that the hydrocarbon bands show a different spatial distribution than that of the atomic emission. In NGC 7027 hydrocarbon distribution was bi-polar in nature, while atomic emission was ring-like. In the Orion Bar hydrocarbon emission was offset from atomic emission by 2-3 arcseconds. Although similar in overall spatial distribution, individual hydrocarbon features exhibited correlations, most significantly between the 3.4 and 3.51 micron features, suggesting a common carrier.
McLean Ian
Smith Erin C.
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