Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..547w&link_type=abstract
Astrophysical Journal, Part 1, vol. 240, Sept. 1, 1980, p. 547-552.
Astronomy and Astrophysics
Astrophysics
16
Interstellar Masers, Molecular Collisions, Molecular Excitation, Silicon Oxides, Vibrational Spectra, Cross Sections, Ground State, Molecular Relaxation
Scientific paper
Because of the likely conclusion that astrophysical SiO masers are pumped by collisions, we have analyzed the properties of collisional pump rates for vibrational-rotational excitations of SiO at high temperatures. We find that the pump rates from the ground vibrational state, and probably from excited vibrational states, are independent of the angular momentum of the final state. The analysis is based on general properties of the cross sections as described by the sudden approximation for the rotational part of the excitation. A detailed knowledge of vibration-rotation cross sections for SiO is thus unnecessary for establishing the primary excitation processes and for progress toward a quantitative understanding of the SiO maser phenomenon.
Previously recognized optical depth effects of the vibrational radiative decays can then provide the inversion mechanism for the excited populations produced by the non selective collisional pump. Basic requirements for collisional pumping of astrophysical SiO masers are noted.
Bieniek Ronald James
Elitzur Moshe
Watson William D.
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