Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985acasn..26..123x&link_type=abstract
(Acta Astronomica Sinica, vol. 26, no. 2, 1985, p. 123-134) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 9, Dec. 19
Astronomy and Astrophysics
Astrophysics
Ammonia, Hyperfine Structure, Microwave Spectra, Molecular Clouds, Molecular Spectra, Abundance, Gas Density, Gas Temperature, Molecular Excitation, Molecular Rotation, Optical Thickness, Ortho Para Conversion
Scientific paper
An improved approach is given for deriving the physical parameters of a molecular cloud by its NH3 rotation-inversion hyperfine spectra. The optical depth tauzero (1,1) of NH3 (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, and 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 NH3 (1, 1) inversion level are derived. The results of the total column density from different assumptions for the abundance ratio of ortho-NH3 and para-NH3 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.
Xing Jianhua
Xu Lan-Ping
No associations
LandOfFree
Determination of physical parameters of NGC 2023 using the hyperfine NH3 spectrum does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Determination of physical parameters of NGC 2023 using the hyperfine NH3 spectrum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determination of physical parameters of NGC 2023 using the hyperfine NH3 spectrum will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1159834