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Extended red emission from carbon clusters in interstellar clouds
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DOI：10.1086/307470.png)
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Abstract
En 中文
We have simulated extended red emission (ERE) spectra using a model in which this emission arises as photoluminescence from small carbon particles of mixed sp(2)/sp(3) hybridized bonding characteristics. The emission efficiency from such particles can be highly efficient when their size is such that geminate recombination of photoexcited electron hole pairs is enhanced. The amplitude and emission profile of the ERE emission from the diffuse interstellar medium and nebular sources such as NGC 2327 and NGC 7027 can be reproduced with a range of average particle size and size distribution. These carbon particles are components of the same mixtures that yield an accurate fit to the interstellar 2175 Angstrom extinction peak and suggest that ERE emission, the 2175 Angstrom absorption, and infrared absorption sit 3.4 mu m may arise from the same carbonaceous components of interstellar matter.
Keywords:
dust, extinction
infrared : ISM : lines and bands
line : identification
radiation mechanisms : nonthermal
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