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Multibeam maser survey of methanol and oxcited OH in the Magellanic Clouds: new detections and maser abundance estimates

机译:麦哲伦星云中甲醇和含氧OH的多束微波激射器调查:新的探测方法和微波激射器丰度估计

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摘要

We present the results of the first complete survey of the Large (LMC) and Small (SMC) Magellanic Clouds for 6668-MHz methanol and 6035-MHz excited-state hydroxyl masers. In addition to the survey, higher sensitivity targeted searches towards known star formation regions were conducted. The observations yielded the discovery of a fourth 6668-MHz methanol maser in the LMC, found towards the star-forming region N160a, and a second 6035-MHz excited-state hydroxyl maser, found towards N157a. We have also re-observed the three previously known 6668-MHz methanol masers and the single 6035-MHz hydroxyl maser. We failed to detect emission from either transition in the SMC. All observations were initially made using the Methanol Multibeam (MMB) survey receiver on the 64-m Parkes telescope as part of the MMB project and accurate positions have been measured with the Australia Telescope Compact Array. We compare the maser populations in the Magellanic Clouds with those of our Galaxy and discuss their implications for the relative rates of massive star formation, heavy metal abundance and the abundance of complex molecules. The LMC maser populations are demonstrated to be smaller than their Milky Way counterparts. Methanol masers are underabundant by a factor of ∼45, whilst hydroxyl and water masers are a factor of ∼10 less abundant than our Galaxy.
机译:我们展示了对6668-MHz甲醇和6035-MHz激发态羟基masers的大(LMC)和小(SMC)麦哲伦星云进行的首次完整调查的结果。除调查外,还对已知的恒星形成区域进行了更高灵敏度的目标搜索。观察结果发现,在LMC中发现了向恒星形成区域N160a的第四个6686-MHz甲醇主峰,以及向N157a发现的第二个6035-MHz激发态羟基主峰。我们还重新观察了三个先前已知的6668-MHz甲醇masers和一个6035-MHz羟基maser。我们无法检测到SMC中任一过渡的排放。作为MMB项目的一部分,所有观测最初都是使用64米Parkes望远镜上的甲醇多束(MMB)测量接收器进行的,并且已经使用澳大利亚望远镜紧凑阵列测量了准确的位置。我们比较了麦哲伦星云和我们银河星系中的maser种群,并讨论了它们对大质量恒星形成,重金属丰度和复杂分子丰度的相对比率的影响。事实证明,LMC maser人口少于银河系。甲醇masers的丰度大约为45,而羟基和水masers的丰度比我们的Galaxy低约10。

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