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Suggestion for the search of 2‐aminoethanol in a cosmic object
Author(s) -
Sharma M. K.,
Sharma M.,
Chandra S.
Publication year - 2018
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201813467
Subject(s) - physics , dipole , cosmic microwave background , radiative transfer , atomic physics , ground state , electric dipole moment , line (geometry) , astrophysics , quantum mechanics , geometry , mathematics , anisotropy
The compound 2‐aminoethanol is considered a precursor to amino acid in interstellar space. Thus, scientists searching for life in the universe have a great interest in its investigation, and therefore, its laboratory spectrum has been analyzed from time to time. It has a large electric dipole moment with components along all the three principal inertial axes: μ a = 2.75 D, μ b = 1.07 D, and μ c = 0.77 D. Corresponding to each component, the energy levels can be classified into two sets. For each of the six sets, using the spectroscopic data of 2‐aminoethanol, we have calculated energies of 150 rotational levels in the ground vibrational state and ground electronic state. For rotational transitions, we have calculated the line intensities and Einstein A ‐coefficients. For each set, using the Einstein A ‐coefficients and scaled values of the collisional rate coefficients, we have solved a set of 150 statistical equilibrium equations coupled with the equations of radiative transfer. In the model, there is a cosmic microwave background corresponding to a temperature of 2.73 K. The brightness temperatures of all the b ‐type and c ‐type transitions are found to be nearly equal to the background temperature. Eight a ‐type transitions are found to demonstrate the anomalous absorption. These transitions may play an important role for the identification of 2‐aminoethanol in a cosmic object.