Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21533504s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #335.04; Bulletin of the American Astronomical Society, Vol. 42, p.435
Astronomy and Astrophysics
Astronomy
Scientific paper
We have mapped 3-micron emission in the Orion Bar using the NIRSPEC instrument at Keck Observatory. By systematically stepping the NIRSPEC entrance slit across the region's extent, we created a data cube with two spatial (10 arcmin x 5 arcmin) dimensions and one spectral dimension (3.0 to 3.8 microns). Using this data cube, we have investigated 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. 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 (Hydrogen) atomic emission. By taking slices of the data cubes we created narrow-band maps of each atomic and hydrocarbon band for comparison to K band continuum emission, as well as 3.3 micron narrow-band images obtained at Lick observatory with FLITECAM. We find that while the region of peak emission for the hydrocarbon bands exhibits a `bar-like’ shape similar to that of the atomic and K band emission, the location of this peak emission is offset by 2-3 arcseconds from the peak atomic emission. 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. We also observe a slight shift in the central wavelength of the 3.4 micron feature in the ionized region of the bar.
McLean Ian S.
Smith Erin C.
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