منابع مشابه
Pumping of Class II methanol masers
We present large velocity gradient (LVG) model calculations which explain the observed intensities (> 1012 K) of the 51−60 A+ methanol line at 6 GHz, which is the brightest of the strong Class II methanol masers. Our model of radiative transfer in the maser source was described in the first paper of this series devoted to the excitation of the 20−3−1 E transition at 12 GHz (Sobolev & Deguchi, 1...
متن کاملPolarisation of Class II Methanol Masers
We have used the University of Tasmania Mt Pleasant 26-m radio telescope to investigate the polarisation characteristics of a sample of strong 6.7GHz methanol masers, the first spectral line polarisation observations to be undertaken with this instrument. As part of this process we have developed a new technique for calibrating linear polarisation spectral line observations. This calibration me...
متن کاملThe Relationship between Class I and Class II Methanol Masers
The Australia Telescope National Facility Mopra millimetre telescope has been used to search for 95.1-GHz class I methanol masers towards sixty-two 6.6-GHz class II methanol masers. A total of twenty-six 95.1-GHz masers were detected, eighteen of these being new discoveries. Combining the results of this search with observations reported in the literature, a near complete sample of sixty-six 6....
متن کاملClass I methanol masers: Masers with EGOs
We have compared the results of a number of published class I methanol maser surveys with the catalogue of high-mass outflow candidates identified from the GLIMPSE survey (known as extended green objects or EGOs). We find class I methanol masers associated with approximately two-thirds of EGOs. Although the association between outflows and class I methanol masers has long been postulated on the...
متن کاملNew class I methanol masers
We review properties of all known collisionally pumped (class I) methanol maser series based on observations with the Australia Telescope Compact Array (ATCA) and the Mopra radio telescope. Masers at 36, 84, 44 and 95 GHz are most widespread, while 9.9, 25, 23.4 and 104 GHz masers are much rarer, tracing the most energetic shocks. A survey of many southern masers at 36 and 44 GHz suggests that ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2002
ISSN: 0074-1809
DOI: 10.1017/s0074180900222353