The CH radical at radio wavelengths: Revisiting emission in the 3.3GHz ground state lines
Arshia M. Jacob,
Karl M. Menten,
Helmut Wiesemeyer
et al.
Abstract:Context. The intensities of the three widely observed radio-wavelength hyperfine structure (HFS) lines between the Λ-doublet components of the rotational ground state of CH are inconsistent with local thermodynamic equilibrium (LTE) and indicate ubiquitous population inversion. While this can be qualitatively understood assuming a pumping cycle that involves collisional excitation processes, the relative intensities of the lines and in particular the dominance of the lowest frequency satellite line has not bee… Show more
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