Hyperfine structure of HCN J = 1-0 and implied physical information concerning NGC 7538 IRS1

Details Hyperfine structure of HCN J = 1-0 and implied physical information concerning NGC 7538 IRS1 Hyperfine structure of HCN J = 1-0 and implied physical information concerning NGC 7538 IRS1

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1027c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 3, p. 1027-1032.

Astronomy and Astrophysics

Astronomy

6

Hydrocyanic Acid, Hyperfine Structure, Interstellar Gas, Molecular Clouds, Radiative Transfer, Local Thermodynamic Equilibrium, Plancks Constant

Scientific paper

Results of HCN observations and calculations for the NGC 7538 molecular cloud using the LGV model are presented. Excitation temperatures of the three hyperfine transitions are not identical due to the differences of radiation trapping and line overlapping of the J = 2-1 transition. The ratio of the intensities of the components of the J = 1-0 transition are influenced by the local line overlapping between the hyperfine components. With respect to scattering effect, the hyperfine components of F = 2-1 and F = 1-1 are formed in the outer envelope due to large opacities, and the F = 0-1 component from the inner core and outer envelope due to the smaller opacity. F = 2-1 and F = 1-1 components come from an outer envelope with an average density of 1.6 x 10 exp 4/cu cm.

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