Other
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..649r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 3/AUG1, P. 649, 1994
Other
8
Scientific paper
Spectra at 8-13 m of several locations within the reflection nebulae NGC 2023 and 1333 are presented. The spectra are dominated by the well-known 11.25- and 8.6- m narrow emission features, together with the long-wavelength wing of the 7.7- m band; the weaker feature at 12.7 m may also be present. The relative intensities of the narrow emission features are similar in the two reflection nebulae, and there is no evidence of emission from other dust species such as silicates or silicon carbide grains. it appears that small silicate grains either are not abundant or are not efficiently excited. The relative intensities of the narrow emission features in the reflection nebulae are similar to those measured in H II region galaxy nuclei, providing further evidence that the mid-infrared emission from these galaxies arises in diffuse regions excited by photons escaping from the nuclear H II regions. Key words: dust, extinction - iSM: individual: NGC 1333 - iSM: individual: NGC 2033 - reflection nebulae - infrared: iSM: lines and bands.
Aitken David K.
Roche Patrick F.
Smith Cotton H.
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