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INTERSTELLAR CLUMP BEHAVIOR AND MAGNETIC EFFECTS IN SMALL CLUMPS

机译:小块中的星际块行为和磁效应

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Cold, dusty molecular clumps (0.01 pc < diameter < 0.50 pc) in the interstellar medium are beginning to reveal their secrets. Using the latest observational findings at sufficiently high angular resolution, an analysis is made of the physical dependencies and energy values inside cold molecular clumps. There are universal physical relations in clumps governing mean parameters such as gas density n, diameter D, magnetic field B, and gas line width σ, with the forms < n > ~ D~c, < B > ~ < D >~p, < B > ~ < n>~k, < σ > ~ < D >~q. For clumps with diameters < 0.5 pc, one finds c = —1.5 ± 0.1, p = —1.5 ± 0.1, k = 1.0 ± 0.2. These exponent values differ from those found by Larson for molecular clouds with sizes greater than 1 pc. These differences in c and k could be indicative of ongoing accretion processes in shocked media as a prelude to star formation. The energy distribution in clumps reveals the following: the support against gravitational collapse in clumps with sizes greater than 0.1 pc comes mainly from turbulent energy, while smaller clumps with sizes less than 0.1 pc are supported by both magnetic and turbulent energies. The clump size of 0.1 pc is critical in many other respects.
机译:星际介质中的冷,尘土飞扬的分子团块(0.01 pc <直径<0.50 pc)开始揭示它们的秘密。使用足够高的角分辨率的最新观测结果,对冷分子团块内部的物理依存关系和能量值进行了分析。团块中的普遍物理关系决定着平均参数,例如气体密度n,直径D,磁场B和气体管线宽度σ,其形式为〜D〜c,〜p, 〜k,<σ>〜〜q。对于直径小于0.5 pc的团块,发现c = -1.5±0.1,p = -1.5±0.1,k = 1.0±0.2。这些指数值不同于Larson对于分子云大于1 pc的发现。 c和k的这些差异可能表明受激介质中正在进行的积聚过程是恒星形成的前奏。团块中的能量分布显示以下内容:尺寸大于0.1 pc的团块对重力坍塌的支持主要来自湍流能量,而尺寸小于0.1 pc的较小团块则由磁能和湍流能量支撑。在许多其他方面,0.1 pc的块大小至关重要。

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