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arXiv 0907.5040astro-ph.GA
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在HH 80 - 81大质量恒星形成区发现极高速"分子子弹"

Discovery of Extremely High Velocity "Molecular Bullets" in the HH 80-81 High-Mass Star-Forming Region

Keping Qiu, Qizhou Zhang

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Accepted for publication in ApJ Letters
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摘要：

我们目前的亚毫米阵列1.3毫米波段连续谱和分子线观测的HH 80 - 81高质量恒星形成区。尘埃连续发射揭示了两个主要的峰值MM1和MM2，和线发射高密度示踪剂表明存在另一个核心MC。来自MM1的分子线发射，它包含了HH 80 - 81射电喷流的激发源，产生了气体温度为110 K的热分子核。两个较年轻的核心MM2和MC似乎都为准直的CO流出提供动力。特别是，从MM2产生的外流表现出射流状形态和190公里/秒的宽速度范围。外流包含紧凑和快速移动的分子团，被称为“分子子弹”，首次发现于低质量的0类原恒星外流。这些“子弹”不可能从周围的气体中被局部携带或扫起，而是更有可能从中央原恒星附近喷出。这一显着外流的发现表明了一个插曲，磁盘介导的吸积大质量恒星的形成。

英文摘要：

We present Submillimter Array 1.3 mm waveband continuum and molecular line observations of the HH 80-81 high-mass star-forming region. The dust continuum emission reveals two dominant peaks MM1 and MM2, and line emission from high-density tracers suggests the presence of another core MC. Molecular line emission from MM1, which harbors the exciting source of the HH 80-81 radio jet, yields a hot molecular core at a gas temperature of 110 K. The two younger cores MM2 and MC both appear to power collimated CO outflows. In particular, the outflow arising from MM2 exhibits a jet-like morphology and a broad velocity range of 190 km/s. The outflow contains compact and fast moving molecular clumps, known as "molecular bullets" first discovered in low-mass class 0 protostellar outflows. These "bullets" cannot be locally entrained or swept up from the ambient gas, but are more likely ejected from the close vicinity of the central protostar. The discovery of this remarkable outflow manifests an episodic, disk-mediated accretion for massive star formation.

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