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Evidence for the Large-Scale Dissociation of Molecular Gas in the Inner Spiral Arms of M81

机译:M81内旋臂中分子气体大规模解离的证据

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摘要

We compare the detailed distributions of H I, Hα, and 150 nm far-UV (FUV) continuum emission in the spiral arms of M81 at a resolution of 9" (linear resolution 150 pc at 3.7 Mpc distance). The bright Hα emission peaks are always associated with peaks in the FUV emission. The converse is not always true; there are many regions of FUV emission with little corresponding Hα. The H I and the FUV are always closely associated, in the sense that the H I is often brightest around the edges of the FUV emission.
机译:我们比较了M81旋臂中HI,Hα和150 nm远紫外(FUV)连续谱发射的详细分布,其分辨率为9“(在3.7 Mpc距离处的线性分辨率为150 pc)。明亮的Hα发射峰为总是与FUV发射中的峰值相关;反之并不一定总是正确的;在FUV发射中有很多区域,而对应的Hα很少; HI和FUV总是紧密相关,因为HI通常在边缘周围最亮FUV排放量。

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