Heterodyne spectroscopy of the 158 micron C II line in M42

Details Heterodyne spectroscopy of the 158 micron C II line in M42 Heterodyne spectroscopy of the 158 micron C II line in M42

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325l..47b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. L47-L51.

Astronomy and Astrophysics

Astrophysics

36

Astronomical Spectroscopy, Interstellar Matter, Optical Heterodyning, Orion Nebula, Ultraviolet Spectra, Carbon Isotopes, Emission Spectra, Fine Structure, Laser Spectroscopy, Optical Thickness, Velocity Distribution

Scientific paper

The authors have obtained velocity-resolved spectra of the 12C II 157.8 μm 2P3/2-2P1/2 fine-structure line in the M42 region of Orion. Observations at 0.8 km s-1 resolution with a laser heterodyne spectrometer show multiple velocity components in some locations, with typical linewidths of 3 - 5 km-1. Spectra of θ1C and BN-KL also show weak emission from the F = 2-1 hyperfine component of the equivalent 13C II line. From the observed 12C II/13C II line intensity ratios, it is deduced that the 12C II emission is optically thick with τ ≈ 5 at both positions.

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