Class I and Class II methanol masers in high-mass star-forming regions
نویسندگان
چکیده
منابع مشابه
The 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....
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Six young bipolar outflows in regions of low-to-intermediate-mass star formation were observed in the 70 − 61A , 80 − 71A , and 5−1 − 40E methanol lines at 44, 95, and 84 GHz, respectively. Narrow features were detected towards NGC 1333IRAS4A, HH 25MMS, and L1157 B1. Flux densities of the detected lines are no higher than 11 Jy, which is much lower than the flux densities of strong maser lines ...
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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 کاملVLBI observations of 6.7 and 12.2 GHz methanol masers toward high mass star-forming regions
We present VLBI observations of 6.7 and 12.2 GHz methanol masers in 14 star-forming regions, namely NGC 7538, S 252, W 75N, W 48, G 31.28+0.06, S 231, S 255, S 269, Mon R2, G 9.62+0.20, Cep A, W 51, G 59.78+0.06 and G 29.950.02. In 10 of these sources, the methanol masers show elongated morphologies in the VLBI map and exhibit linear velocity gradients. These linear structures have lengths of 5...
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics
سال: 2010
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/200913679