A survey of the millimeter-wave spectrum of Sagittarius B2

Details A survey of the millimeter-wave spectrum of Sagittarius B2 A survey of the millimeter-wave spectrum of Sagittarius B2

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apjs...60..819c&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 60, March 1986, p. 819-878.

Astronomy and Astrophysics

Astrophysics

179

Abundance, Astronomical Spectroscopy, Line Spectra, Millimeter Waves, Molecular Clouds, Radio Spectra, Galactic Nuclei, Milky Way Galaxy, Molecular Rotation, Molecular Spectra, Nebulae, Spectral Resolution

Scientific paper

More than 60 percent of the millimeter wave spectrum between 70 and 150 GHz of the giant Sgr B2 molecular cloud was surveyed with the Bell Laboratories 7 m telescope at a spectral resolution of 1 MHz. The observations and instrumentation are described, including beam efficiency and beamwidth as functions of frequency, frequency coverage, and rms noise. The catalog used to identify the 457 lines found is summarized, and the analysis of the data to determine column densities and rotational temperatures is discussed. The range of rotational temperatures obtained and their relation to the kinetic temperature, and their implications for the hydrogen density, are considered. More than 300 lines are transitions of 21 molecules, and the results for these are analyzed, giving excitation diagrams for most of them. A partly successful attempt is made to use ratios of the calculated abundances to predict abundances of as yet undetected species. Finally, the spectra for the entire survey are presented.

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