Radio recombination line observations of the C II region NGC 2023

Details Radio recombination line observations of the C II region NGC 2023 Radio recombination line observations of the C II region NGC 2023

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...196..167k&link_type=abstract

Astrophysical Journal, vol. 196, Feb. 15, 1975, pt. 1, p. 167-177.

Astronomy and Astrophysics

Astronomy

34

Atomic Recombination, Carbon, Interstellar Matter, Line Spectra, Nebulae, Radio Astronomy, Carbon Monoxide, Electron Density Profiles, Emission Spectra, Ion Density (Concentration), Optical Reflection, Radiative Recombination, Radio Spectra

Scientific paper

The reflection nebula NGC 2023 has been observed at four frequencies in a study of its carbon recombination line emission. The observations show the recombination line region to be about 2 pc in diameter, with an average electron density of about 0.2 per cu cm and electron temperature of about 20 K. The electron density increases exponentially near the B1.5 star HD 37903, the illuminating star of NGC 2023. The most reasonable interpretation of the observational results is that the carbon emission lines arise in a cold C II region surrounding HD 37903. The coexistence of the C II region with a region of enhanced CO emission suggests that the CO in NGC 2023 may be excited by electron collisions.

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