Upper limit on C60 and C60+ features in the ISO-SWS spectrum of the reflection nebula NGC 7023

Details Upper limit on C60 and C60+ features in the ISO-SWS spectrum of the reflection nebula NGC 7023 Upper limit on C60 and C60+ features in the ISO-SWS spectrum of the reflection nebula NGC 7023

1999-05-28

arxiv.org/abs/astro-ph/9905374v1

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, accepted by A&A

Scientific paper

We present here the 7.0-8.7 micron spectrum of the bright reflection nebula NGC 7023. Our observations are made with the Short Wavelength Spectrometer (SWS) on the European satellite Infrared Space Observatory (ISO). The vibrational bands of the ionized fullerene C60+ are expected at 7.11 and 7.51 microns, while those of the neutral fullerene C60 are expected at 7.0 and 8.45 microns. We estimate an upper limit in NGC 7023 for the C60+ abundance of <0.26% of the interstellar abundance of carbon, while C60 contains <0.27% of interstellar carbon.

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