Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apjs...60..357b&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 60, Jan. 1986, p. 357-374.
Astronomy and Astrophysics
Astronomy
115
Astronomical Spectroscopy, Emission Spectra, Interstellar Matter, Molecular Clouds, Orion Nebula, Rotational Spectra, Infrared Astronomy, Line Spectra, Millimeter Waves, Positive Ions
Scientific paper
Results are presented from a molecular line survey of the core of the Orion molecular cloud between 247 and 263 GHz. The spectrum contains a total of 243 resolvable lines from 23 different chemical species. When combined with the earlier survey of Orion from 215 to 247 GHz by Sutton et al. (1985), the complete data set includes over 780 emission features from 29 distinct molecules. Of the 23 molecules detected in this survey, only NO, CCH, and HCO(+) were not identified in the lower frequency data. As a result of the supporting laboratory spectroscopy performed to supplement existing millimeter-wave spectral line catalogs, only 33 of the more than 780 lines remain unidentified, of which 16 occur in the upper frequency band. A significant chance remains that a number of these unidentified lines are due to transitions between states of either isotopically substituted or highly excited abundant and complex molecules such as CH3OH, CH3OCH3, and HCOOCH3, whose rotational spectra are poorly known at present. The very small percentage and weak strength of the unidentified lines implies that the dominant chemical constituents visible at millimeter wavelengths have been identified in the Orion molecular cloud.
Blake Geoffrey A.
Masson Colin R.
Phillips Thomas G.
Sutton Edmund C.
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