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EVIDENCE FOR A LARGE THERMAL PRESSURE IMBALANCE IN THE LOCAL INTERSTELLAR MEDIUM

机译：在当地星际介质中出现大的热压不平衡的证据

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摘要

THE interstellar medium (ISM) comprises a number of components at very different densities and temperatures, from dense molecular gas at 10 K to very diffuse plasma at 10(6) K. It has generally been assumed that the warm (10(4) K) and hot (similar to 10(6) K) components are in thermal pressure equilibrium(1-3), although this has not been universally accepted(4). Here we use the discovery of a shadow in the diffuse extreme ultraviolet background radiation(5), cast by a nearby cloud of cool hydrogen, to calculate directly the thermal pressure in the nearby (less than or equal to 40 pc) hot ISM. We find that it is 20 times greater than in the warm cloud surrounding the Sun. This result directly contradicts the basic assumption of thermal pressure balance in the ISM, indicating that some unidentified force (such as confinement by magnetic fields(6)) must play an important role in the overall pressure balance. [References: 21]
机译：星际介质（ISM）包含许多在不同密度和温度下的成分，从10 K的致密分子气体到10（6）K的非常弥散的等离子体。通常假定温暖的（10（4）K ）和热（类似于10（6）K）组件处于热压平衡状态（1-3），尽管尚未被普遍接受（4）。在这里，我们利用在附近的冷氢云中投射出的漫射极紫外背景辐射（5）中的阴影的发现，直接计算附近（小于或等于40 pc）热ISM中的热压力。我们发现它比太阳周围的暖云大20倍。该结果直接与ISM中热压平衡的基本假设相矛盾，表明某些不确定的力（例如磁场限制（6））必须在整体压力平衡中起重要作用。 [参考：21]

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