Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21440212s&link_type=abstract
American Astronomical Society, AAS Meeting #214, #402.12; Bulletin of the American Astronomical Society, Vol. 41, p.664
Other
1
Scientific paper
The 18.9 micron feature observed in some regions of reflection nebulae has been suggested to be due to buckminsterfullerene (C60) rather than polycyclic aromatic hydrocarbons (PAHs). A test of this hypothesis is to search for other fullerene (neutral and ionized C60) lines at 7-9 micron at regions where the 18.9 micron feature is bright. We report Spitzer/IRS 5-15 micron spectra, of the reflection nebulae NGC 2023 and NGC 7023, inside and outside regions of bright 18.9 micron emission. We detect a predicted fullerene feature at 7.05 microns, only in regions with strong 18.9 micron emission, and place an upper limit on other fullerene features at 7.5 microns (singly ionized C60) and 8.5 microns (neutral C60). We compare the interstellar fullerene abundance inferred from these observations with previous detections of diffuse interstellar bands attributed to singly ionized C60, and other previous upper limits on neutral and ionized C60 in the interstellar medium. Support for this work was provided by NASA.
Ingalls James G.
Sellgren Kristen
Werner Michael W.
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