Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982nyasa.395..170m&link_type=abstract
(NASA, National Science Foundation, New York Academy of Sciences, et al., Symposium on the Orion Nebula to Honor Henry Draper, N
Astronomy and Astrophysics
Astronomy
9
Astronomical Spectroscopy, Orion Nebula, Radio Astronomy, Brightness Distribution, Carbon, Emission Spectra, Forbidden Transitions, Radial Velocity, Spectral Line Width
Scientific paper
A map of Orion A in radiation of forbidden C I wavelength 9850, with a resolution of 80 arcsec, down to a level of intensity 20 Ray, is obtained. The brightness distribution in forbidden C I is found to be flatter than that in H-alpha, with the apparent intensity ratio forbidden C I/H-alpha varying between 0.006-0.0004. A similar map of Orion B, with a resolution of 2 arcmin, down to a level of 7 Ray, is found to demonstrate that the visually conspicuous central obscuration lane, behind which the maximum continuum radio emission arises, appears to be bright in forbidden C I. A high-resolution profile of forbidden C I wavelength 9850 in Orion A indicates that its FWHM is 6.1 km/s, significantly smaller than that of any other nonradio nebular line. It is concluded that the forbidden C I emission likely arises either by recombination in cool C II regions or by being excited by shocks.
Hippelein H. H.
Mﾃｼnch Guido
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