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Determination of physical parameters of NGC 2023 using the hyperfine NH3spectrum

Authors
Journal
Chinese Astronomy and Astrophysics
0275-1062
Publisher
Elsevier
Publication Date
Volume
9
Issue
4
Identifiers
DOI: 10.1016/0275-1062(85)90020-7

Abstract

Abstract An improved approach is given for deriving the physical parameters of a molecular cloud by its NH 3 rotation-inversion hyperfine spectra. The optical depth τ 0(1, 1) of NH 3 (1,1) is obtained by considering the blending effect of the magnetic hyperfine spectral lines, the (1-1) excitation temperature T ex (1, 1) is calculated by a two level model, the effect of different collision rate and the thermalization of the (1, 1) inversion lines are discussed, the rotation temperature T R ( 2, 1) between the NH 3 levels (2, 2) and (1, 1) and the column density N( 1, 1) of the NH 3 (1, 1) inversion level are derived, the results of the total column density from different assumptions for the abundance ratio of ortho-NH 3 and para-NH 3 are also discussed. This approach is used for the molecular cloud NGC 2023 by using the relevant observed data and its optical depth and other physical parameters are obtained.

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