SIMBAD references

2004MNRAS.354..401E - Mon. Not. R. Astron. Soc., 354, 401-413 (2004/October-3)

Discovery of new 19.9-GHz methanol masers in star-forming regions.

ELLINGSEN S.P., CRAGG D.M., LOVELL J.E.J., SOBOLEV A.M., RAMSDALE P.D. and GODFREY P.D.

Abstract (from CDS):

We have used the NASA Tidbinbilla 70-m antenna to search for emission from the 21-30E (19.9-GHz) transition of methanol. The search was targeted towards 22 star formation regions that exhibit maser emission in the 107.0-GHz 31-40A+ methanol transition, and in the 6.6-GHz 51-60A+ transition characteristic of class II methanol maser sources. A total of seven sources were detected in the 21-30E transition, six 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 that exhibit 19.9-GHz methanol masers and those that 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 these observations are consistent with gas temperatures of 50 K, dust temperatures of 150-200 K and gas densities of 106.5-107.5/cm3.


Abstract Copyright: 2004 RAS

Journal keyword(s): masers - stars: formation - ISM: molecules - radio lines: ISM

Simbad objects: 26

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2019.12.11-14:33:06

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