SIMBAD references

1999ApJS..123..515S - Astrophys. J., Suppl. Ser., 123, 515-536 (1999/August-0)

Nonequilibrium excitation of methanol in galactic molecular clouds: multitransitional observations at 2 millimeters.

SLYSH V.I., KALENSKII S.V., VAL'TTS I.E., GOLUBEV V.V. and MEAD K.

Abstract (from CDS):

We observed 14 methanol transitions near λ=2 mm in Galactic star-forming regions. Broad, quasi-thermal J0-J–1E methanol lines near 157 GHz were detected toward 73 sources. Together with the 6–1-50E and 5–2-6–1E lines at 133 GHz and the 71-70E line at 166 GHz, they were used to study the methanol excitation. In the majority of the observed objects, the Class I 6–1-50E transition is inverted, and the Class II 5–2-6–1E and 60-6–1E transitions are overcooled. This is exactly as predicted by models of low-gain Class I masers. The absence of the inversion of Class II transitions 5–2-6–1E and 60-6–1E means that quasi-thermal methanol emission in all objects arises in areas without a strong radiation field, which is required for the inversion.

Abstract Copyright:

Journal keyword(s): ISM: Clouds - ISM: Molecules - Radio Lines: ISM

Simbad objects: 87

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:1999ApJS..123..515S and select 'bookmark this link' or equivalent in the popup menu


2019.09.20-19:08:40

© Université de Strasbourg/CNRS

    • Contact