منابع مشابه
The polarization of mm methanol masers
We present a survey of the polarization properties of mm-wavelength methanol masers, comprising both classes, and transitions from 84.5 to 157.0 GHz. Linear polarization is found in more than half of the observed objects, and circular polarization is tentatively detected in two sources. Class I and Class II CH3OH masers show similar polarization properties. The largest linear polarization is fo...
متن کاملPolarization properties of 6.7 GHz methanol masers in NGC6334F
The Australia Telescope Compact Array (ATCA) has been used to make the first full polarization observations of 6.7 GHz methanol masers. Linear polarization was detected towards all four sources observed, at levels between a few and 10%, while none of the sources show circular polarization stronger than approximately 1.5%. Linear polarization appears to be more common in the 6.7 GHz methanol mas...
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 ...
متن کاملPumping 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...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2004
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20040343