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19 April 2024 |
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Discovery of new 19.9-GHz methanol masers in star forming regions | | S.P. Ellingsen
; D.M. Cragg
; J.E.J. Lovell
; A.M. Sobolev
; P.D. Ramsdale
; P.D. Godfrey
; | | Date: |
13 Jul 2004 | | Subject: | astro-ph | | Abstract: | We have used the NASA Tidbinbilla 70-m antenna to search for emission from the 2(1)-3(0)E 19.9-GHz transition of methanol. The search was targeted towards 22 star formation regions which exhibit maser emission in the 107.0-GHz 3(1)-4(0)A+ methanol transition, as well as in the 6.6-GHz 5(1)-6(0)A+ transition characteristic of class II methanol maser sources. A total of 7 sources were detected in the 19.9-GHz transition, 6 of these being new detections. Many of the new detections are weak (< 0.5 Jy), however, they appear to be weak masers rather than thermal or quasi-thermal emission. We find a strong correlation between sources which exhibit 19.9-GHz methanol masers and those which both have the class II methanol masers projected against radio continuum emission and have associated 6035-MHz OH masers. This suggests that the 19.9-GHz methanol masers arise in very specific physical conditions, probably associated with a particular evolutionary phase. In the model of (Cragg, Sobolev & Godfrey 2002) these observations are consistent with gas temperatures of 50 K, dust temperatures of 150-200 K and gas densities of 10^6.5-10^7.5 cm^-3. | | Source: | arXiv, astro-ph/0407246 | | Services: | Forum | Review | PDF | Favorites | |
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