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Article overview
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Non-equilibrium excitation of methanol in Galactic molecular clouds: multi-transitional observations at 2 mm | V.I. Slysh
; S.V. Kalenskii
; I.E. Val’tts
; V.V. Golubev
; K. Mead
; | Date: |
4 Jun 1999 | Journal: | Astrophys.J.Suppl. 123 (1999) 515-536 | Subject: | astro-ph | Affiliation: | Astro Space Center, Lebedev Physical Institute, Moscow, Russia, National Radio Astronomy Observatory, Arizona Operations, Tucson, AZ | Abstract: | We observed 14 methanol transitions near lambda=2 mm in Galactic star-forming regions. Broad, quasi-thermal J(0)-J(-1)E methanol lines near 157 GHz were detected toward 73 sources. Together with the 6(-1)-5(0)E and 5(-2)-6(-1)E lines at 133 GHz and the 7(1)-7(0)E line at 165 GHz, they were used to study the methanol excitation. In the majority of the observed objects, the Class I 6(-1)-5(0)E transition is inverted, and the Class II 5(-2)-6(-1)E and 6(0)-6(-1)E 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(-1)E and 6(0)-6(-1)E means that quasi-thermal methanol emission in all objects arises in areas without a strong radiation field, which is required for the inversion. | Source: | arXiv, astro-ph/9906090 | Services: | Forum | Review | PDF | Favorites |
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