GRAVITATIONAL INFALL ONTO MOLECULAR FILAMENTS. II. EXTERNALLY PRESSURIZED CYLINDERS
GRAVITATIONAL INFALL ONTO MOLECULAR FILAMENTS. II. EXTERNALLY PRESSURIZED CYLINDERS
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分子丝上的重力侵入。
DOI：
10.1088/0004-637x/776/1/62
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
F. Heitsch
中科院分区：
文献类型：
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作者：
F. Heitsch
讨论了外压静液细丝演变的两个方面。(1)气体在这种细丝上的自由落体吸积将导致细丝参数（具体来说，fwhm -柱密度关系）与Arzoumanian等人的观测结果不一致，除了两种情况：对于低质量、等温细丝，与Fischera & Martin的分析一致。磁化情况下，场强随密度B∝n1/2的尺度变弱，也能再现观测到的参数。(2)实际上，灯丝不仅可以嵌入非零压力的气体中，而且可以嵌入非零密度的气体中。因此，探索了片状嵌入细丝的外观。生成细丝模型的网格，并将结果柱密度比和轮廓形状与观测结果进行比较，表明三维细丝轮廓本质上比等温更平坦，超出了投影和进化效应。
Two aspects of the evolution of externally pressurized, hydrostatic filaments are discussed. (1) The free-fall accretion of gas onto such a filament will lead to filament parameters (specifically, FWHM–column-density relations) inconsistent with the observations of Arzoumanian et al., except for two cases: for low-mass, isothermal filaments, agreement is found as in the analysis by Fischera & Martin. Magnetized cases, for which the field scales weakly with the density as B∝n1/2, also reproduce observed parameters. (2) Realistically, the filaments will be embedded not only in gas of non-zero pressure, but also of non-zero density. Thus, the appearance of sheet-embedded filaments is explored. Generating a grid of filament models and comparing the resulting column density ratios and profile shapes with observations suggests that the three-dimensional filament profiles are intrinsically flatter than isothermal, beyond projection and evolution effects.