ALMA OBSERVATIONS OF A HIGH-DENSITY CORE IN TAURUS: DYNAMICAL GAS INTERACTION AT THE POSSIBLE SITE OF A MULTIPLE STAR FORMATION
ALMA OBSERVATIONS OF A HIGH-DENSITY CORE IN TAURUS: DYNAMICAL GAS INTERACTION AT THE POSSIBLE SITE OF A MULTIPLE STAR FORMATION
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DOI：
10.1088/2041-8205/789/1/l4
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发表时间：
2014-05
期刊：
影响因子：
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通讯作者：
K. Tokuda;T. Onishi;K. Saigo;A. Kawamura;Y. Fukui;Tomoaki Matsumoto;S. Inutsuka;M. Machida;K. Tomida;K. Tachihara
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作者：
K. Tokuda;T. Onishi;K. Saigo;A. Kawamura;Y. Fukui;Tomoaki Matsumoto;S. Inutsuka;M. Machida;K. Tomida;K. Tachihara
无星的致密核心最终会动态坍缩，在内部形成原恒星，核心的物理性质决定了形成原恒星的性质。我们报告了阿尔马观测到的尘埃连续辐射和分子旋转线朝向MC27或L1521 F，这被认为是非常接近第一个原恒星核心阶段。我们发现了一些无星的高密度核心，其中一个具有非常高的密度，为107 cm−3，在斯皮策探测到的一颗非常低光度的原恒星周围数百个Au的区域内。一个非常紧凑的双极外流的动力学时间尺度为几百年被发现对原恒星。分子线观测显示了几个弧形结构的核心，可能是由于动力学气体相互作用。这些复杂的结构揭示了星星形成的初始条件在本质上是高度动态的，这被认为是理解星星形成的基本问题，如多星形成和恒星初始质量函数起源的关键因素。
Starless dense cores eventually collapse dynamically, forming protostars inside them, and the physical properties of the cores determine the nature of the forming protostars. We report ALMA observations of dust continuum emission and molecular rotational lines toward MC27 or L1521F, which is considered to be very close to the first protostellar core phase. We found a few starless high-density cores, one of which has a very high density of ∼107 cm−3, within a region of several hundred AU around a very low-luminosity protostar detected by Spitzer. A very compact bipolar outflow with a dynamical timescale of a few hundred years was found toward the protostar. The molecular line observation shows several cores with an arc-like structure, possibly due to the dynamical gas interaction. These complex structures revealed in the present observations suggest that the initial condition of star formation is highly dynamical in nature, which is considered to be a key factor in understanding fundamental issues of star formation such as the formation of multiple stars and the origin of the initial mass function of stars.