甲醇多波束巡天
The Methanol Multibeam Survey
摘要：
一个专门建造的7光束甲醇接收器，安装在帕克斯射电望远镜，被用来调查新形成的高质量恒星，在6.7 GHz的强甲醇脉泽发射的银河系平面。甲醇多波束（MMB）观测了超过60%的银河平面，探测到近1000个源。MMB巡天为研究大质量恒星的形成提供了巨大的资源，这是星际介质演化的一个重要阶段。MMB巡天也是研究银河系结构和动力学的宝贵资源：6.7 GHz甲醇脉泽的发射速度范围很窄（通常只有几公里/秒），速度与周围分子云的系统速度密切相关，因此可以提供螺旋臂速度及其结构的估计。在概述最近的结果之前，我将讨论MMB调查的技术和性质，其中包括识别被认为是螺旋臂起源的指示性恒星形成增强的区域以及银河棒与3 kpc臂的相互作用。我还将讨论各种后续计划，包括通过相关的羟基脉泽研究磁场。
英文摘要：
A purpose built 7-beam methanol receiver, installed on the Parkes Radio Telescope, was used to survey the Galactic plane for newly forming high mass stars, pinpointed by strong methanol maser emission at 6.7 GHz. The Methanol Multibeam (MMB) survey observed over 60% of the Galactic plane, detecting close to 1000 sources. The MMB survey provides a huge resource for studies of high-mass star formation, an important stage in the evolution of the interstellar medium. The MMB survey is also a valuable resource for investigations into the structure and dynamics of our Galaxy: with narrow velocity ranges of emission (typically only a few km/s) and velocities closely correlated with the systemic velocity of their surrounding molecular clouds, 6.7-GHz methanol masers provide estimates of the spiral arm velocities and their structure. I will discuss the techniques and properties of the MMB survey, before outlining recent results, which include the identification of regions of enhanced star formation believed to be indicative of the origins of the spiral arms and the interaction of the Galactic bar with the 3-kpc arms. I will also discuss the various follow-up programmes including a study of magnetic fields through associated hydroxyl masers.
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