arXiv 1507.087862015-07-31astro-ph.GAastro-ph.SR

狼疮分子云中的细丝

Filaments in the Lupus molecular clouds

M. Benedettini, E. Schisano, S. Pezzuto, D. Elia, P. André, V. Könyves, N. Schneider, P. Tremblin, D. Arzoumanian, A. M. di Giorgio, J. Di Francesco, T. Hill, S… 展开作者

M. Benedettini, E. Schisano, S. Pezzuto, D. Elia, P. André, V. Könyves, N. Schneider, P. Tremblin, D. Arzoumanian, A. M. di Giorgio, J. Di Francesco, T. Hill, S. Molinari, F. Motte, Q. Nguyen-Luong, P. Palmeirim, A. Rivera-Ingraham, A. Roy, K. L. J. Rygl, L. Spinoglio, D. Ward-Thompson, G. J. White

备注：: 16 pages, 16 figures
DOI：: 10.1093/mnras/stv1750

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摘要：

我们研究了从附近的狼疮1，3和4分子云的柱密度图中提取的细丝，这些分子云来自赫歇尔卫星观测到的光度图。狼疮云中的细丝具有相当低的柱密度，其中值为1.5 $\sim$ 10 $^{21}$ cm $^{-2}$，并且大多数的单位长度质量低于径向引力坍缩的最大临界值。事实上，在气体运动学中没有发现细丝收缩的证据。我们发现，一些平均处于热亚临界状态的细丝，含有致密的核心，最终可能形成恒星。这表明，在低柱密度区域，恒星形成的临界条件可能只在局部达到，而这种条件不是暗条的全局性质。最后，在狼疮中，我们发现了多个观测证据，证明磁场在形成细丝中起着关键作用，并决定了它们的限制和动力学演化。

英文摘要：

We have studied the filaments extracted from the column density maps of the nearby Lupus 1, 3, and 4 molecular clouds, derived from photometric maps observed with the Herschel satellite. Filaments in the Lupus clouds have quite low column densities, with a median value of $\sim$1.5$\times$10$^{21}$ cm$^{-2}$ and most have masses per unit length lower than the maximum critical value for radial gravitational collapse. Indeed, no evidence of filament contraction has been seen in the gas kinematics. We find that some filaments, that on average are thermally subcritical, contain dense cores that may eventually form stars. This is an indication that in the low column density regime, the critical condition for the formation of stars may be reached only locally and this condition is not a global property of the filament. Finally, in Lupus we find multiple observational evidences of the key role that the magnetic field plays in forming filaments, and determining their confinement and dynamical evolution.

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