New 9.9-GHz methanol masers

被引：64

作者：

Voronkov, M. A. ^{[1
,2
]}

Caswell, J. L. ^{[1
]}

Ellingsen, S. P. ^{[3
]}

Sobolev, A. M. ^{[4
]}

机构：

[1] CSIRO Astron & Space Sci, Australia Telescope Natl Facil, Epping, NSW 1710, Australia

[2] Astro Space Ctr, Moscow 117997, Russia

[3] Univ Tasmania, Sch Math & Phys, Hobart, Tas 7000, Australia

[4] Ural State Univ, Ekaterinburg 620083, Russia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2010年 / 405卷 / 04期

基金：

俄罗斯基础研究基金会; 美国国家航空航天局;

关键词：

masers; stars: formation; ISM: H ii regions; ISM: molecules; YOUNG STELLAR OBJECTS; H-II REGIONS; EXTENDED GREEN OBJECTS; STAR-FORMING REGIONS; INTERSTELLAR METHANOL; RESOLUTION OBSERVATIONS; RADIO-CONTINUUM; 6.7; GHZ; OUTFLOW SIGNATURES; MASSIVE PROTOSTAR;

D O I：

10.1111/j.1365-2966.2010.16624.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Australia Telescope Compact Array has been used to make the first extensive search for the class I methanol masers at 9.9 GHz. In total, 48 regions of high-mass star formation were observed. In addition to masers in W33-Met (G12.80-0.19) and G343.12-0.06 (IRAS 16547-4247) which have already been reported in the literature, two new 9.9-GHz masers have been found towards G331.13-0.24 and G19.61-0.23. We have determined absolute positions (accurate to roughly a second of arc) for all the detected masers and suggest that some class I masers may be associated with shocks driven into molecular clouds by expanding H ii regions. Our observations also imply that the evolutionary stage of a high-mass star-forming region when the class I masers are present can outlast the stage when the class II masers at 6.7-GHz are detectable, and overlaps significantly with the stage when OH masers are active.

引用

页码：2471 / 2484

页数：14

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