Review of galactic and extragalactic searches for class I methanol masers
Review of galactic and extragalactic searches for class I methanol masers
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DOI：
10.1007/s11434-014-0191-z
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发表时间：
2014-02
影响因子：
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通讯作者：
Xi Chen;S. Ellingsen;C. Gan;Ye Xu;Zhiqiang Shen
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文献类型：
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作者：
Xi Chen;S. Ellingsen;C. Gan;Ye Xu;Zhiqiang Shen
I类甲醇脉泽是研究宇宙中星星形成的重要工具。最近，在95 GHz的过渡到年轻的恒星物体样品的I类甲醇脉泽的一系列调查已经进行。这些调查导致了大约200个新的I类甲醇脉泽的检测，并结合以前的观察，他们增加了已知的I类甲醇脉泽在我们的银河系的数量~400。通过对I类甲醇脉泽发射与相关天体关系的分析，表明I类甲醇脉泽发射强度与1.1mm Bolocam银道巡天（BGPS）尘埃连续源的性质和外流性质密切相关。这进一步支持了一类甲醇脉泽在冲击区是碰撞泵浦和激发的假设。根据这些观测结果，可以推断BGPS星表可能为进一步的I类甲醇脉泽搜索提供更可靠的样本。一个新的调查I类甲醇脉泽对更大规模的BGPS源的样本，以测试这一点，目前正在进行中。本文讨论了在河外源探测I类甲醇超脉泽的前景，并提出了构成第一次灵敏搜索的观测结果。
Class I methanol masers are important tools for investigations of star formation throughout the Universe. Recently, a series of surveys for class I methanol masers at the 95 GHz transition toward samples of young stellar objects have been undertaken. These surveys have resulted in the detection of about 200 new class I methanol masers and combined with previous observations they have increased the number of known class I methanol masers in our Galaxy to ~400. From analysis of the relationship between class I methanol maser emission and associated astrophysical objects, it has been shown that the intensity of the class I methanol maser emission is closely correlated with the properties of the 1.1 mm Bolocam Galactic Plane Survey (BGPS) dust continuum sources and outflow properties. This further supports the hypothesis that class I methanol masers are collisionally pumped and excited in shocked regions. Based on these observations, it can be inferred that the BGPS catalog is likely to provide more reliable samples for targeting further class I methanol maser searches. A new survey for class I methanol masers toward a larger size sample of BGPS sources to test this is currently underway. The prospects for detecting class I methanol megamasers in extragalactic sources is discussed, and observations constituting the first sensitive search have been proposed.