arXiv 1006.07332010-06-03astro-ph.SR

云核演化与恒星形成

The Evolution of Cloud Cores and the Formation of Stars

Avery E. Broderick, Eric Keto

备注：: 12 pages, 7 figures, submitted to ApJ
DOI：: 10.1088/0004-637X/721/1/493

摘要：

对于一些无星的核心，自吸收分子线和柱密度的观测暗示了大振幅振荡的存在。我们研究这些振荡的核心和解释他们的意见的演变的后果。我们发现脉动能量有助于支撑核心，而这种能量的耗散会导致不稳定和恒星形成。在这幅图中，核心的寿命受到脉动衰减时间尺度的限制，主要是非线性模-模耦合，大约是几个x 10^5- 10^6年。值得注意的是，这与解释核心转化为恒星的相对较低速率所需的相似。对于大振幅振荡的核心，尘埃连续观测可能会出现不对称或不规则。因此，当考虑到振荡时，一些被分类为超临界的堆芯可能是动态稳定的。因此，我们的研究激发了一个简单的流体动力学图片，能够再现恒星祖先的许多特征，而不包括额外的物理过程，如大规模磁场。

英文摘要：

For a number of starless cores, self-absorbed molecular line and column density observations have implied the presence of large-amplitude oscillations. We examine the consequences of these oscillations on the evolution of the cores and the interpretation of their observations. We find that the pulsation energy helps support the cores and that the dissipation of this energy can lead toward instability and star formation. In this picture, the core lifetimes are limited by the pulsation decay timescales, dominated by non-linear mode-mode coupling, and on the order of ~few x 10^5--10^6 yr. Notably, this is similar to what is required to explain the relatively low rate of conversion of cores into stars. For cores with large-amplitude oscillations, dust continuum observations may appear asymmetric or irregular. As a consequence, some of the cores that would be classified as supercritical may be dynamically stable when oscillations are taken into account. Thus, our investigation motivates a simple hydrodynamic picture, capable of reproducing many of the features of the progenitors of stars without the inclusion of additional physical processes, such as large-scale magnetic fields.

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