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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/59945
Dense cores of interstellar molecular gas
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From the analysis of real observation data concerning the (J;K) = (1; 1) and (J;K) = (2; 2) inversion
transitions of the ammonia molecule, I estimated the physical parameters for the molecular cloud
L1228. First of all, I identi ed the lines of interest in twelve di erent spectra, measured in a
twelve-point grid which also allowed me to outline a map of the dense region. Secondly, by means
of the maximum intensity and the FWHM of the transition lines, after being tted to a gaussian
distribution, I characterized the (J;K) = (1; 1) transition by the optical depth and the excitation
temperature. Lastly, I found some important properties of the condensation such as its size, the
kinetic temperature and the column and volume densities leading to two di erent values of the mass
whose discrepancy con rmed that the region is not optically thin. Comparing my results for the
clump mass with the virial mass, I was able to state the approximate equilibrium of the dense core
of L1228.
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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Any: 2014, Tutora: Rosario López
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PINNA, Francesca. Dense cores of interstellar molecular gas. [consulted: 14 of October of 2026]. Available at: https://hdl.handle.net/2445/59945