Submillimeter spectral line observations in very dense regions

Details Submillimeter spectral line observations in very dense regions Submillimeter spectral line observations in very dense regions

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..344e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 1, 1987, p. 344-350.

Astronomy and Astrophysics

Astrophysics

29

Astronomical Models, Line Spectra, Microwave Spectra, Molecular Clouds, Star Formation, Density Distribution, Molecular Spectra, Submillimeter Waves, Telescopes

Scientific paper

In a search for very high density regions, the Millimeter Wave Observatory 5 m telescope was used to observe several submillimeter lines. The cores of M17, S140, and NGC 2024 were observed in the CS(J = 7→6), H2CO(JK-1 K1 = 515→414), and HCN(J = 4→3) lines. These data are combined with data at millimeter wavelengths to derive the volume density. If only the highest excitation CS and H2CO lines are compared, there is evidence for some densities up to about 107cm-3, but the uncertainties are large.

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