Subarcsecond SMA observations of the prototype Class 0 object VLA1623 at 1.3 mm: a single protostar with a structured outflow cavity?
Subarcsecond SMA observations of the prototype Class 0 object VLA1623 at 1.3 mm: a single protostar with a structured outflow cavity?
复制标题
1.3 毫米处原型 0 类天体 VLA1623 的亚弧秒 SMA 观测：具有结构化流出腔的单个原恒星？
DOI：
10.1051/0004-6361/201118180
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发表时间：
2012
影响因子：
6.5
通讯作者：
P. Andre'
中科院分区：
文献类型：
--
作者：
A. Maury;N. Ohashi;P. Andre'
我们给出了对典型的0类原星VLA1623的1.3毫米亚角秒SMA观测。我们报告了从中心原恒星组件VLA1623和另外两个源Knot-A和KnotB探测到的1.3毫米连续辐射，这两个源已经在更长的波长上被探测到。纽结-A和纽结-B都位于由VLA1623流出的原恒星打开的西腔壁上。我们的SMA观测还表明，这两个连续谱源与明亮的、高速的12CO(2-1)发射有关，相对于1.3 mm的连续谱发射峰在流出传播方向的下游略有移动。纽结A和纽结B沿原恒星流出空穴的排列，其1.3毫米连续发射的紧凑性，以及相关CO发射的性质表明，这两个源跟踪的是沿空腔壁激波的流出特征，而不是原恒星天体。虽然它被认为是迄今为止最接近的原双星系统之一，但目前的分析表明，在我们的SMA观测所探测的a>；100 AU尺度上，原型的0级VLA1623是单一的。此外，我们还给出了原恒星喷流与0类原恒星包层相互作用产生的致密毫米波连续辐射的第二个稳健的例子，这表明在嵌入相期间这些流出特征发生得很高。
We present 1.3-mm subarcsecond SMA observations of the prototypical Class 0 protostar VLA1623. We report the detection of 1.3-mm continuum emission both from the central protostellar component VLA1623 and two additional sources, Knot-A and KnotB, which have been already detected at longer wavelengths. Knot-A and Knot-B are both located along the western cavity wall opened by the protostellar outflow from VLA1623. Our SMA observations moreover show that these two continuum sources are associated with bright, high-velocity 12 CO(2–1) emission, slightly shifted downstream of the outflow propagation direction with respect to the 1.3-mm continuum emission peaks. The alignment of Knot-A and Knot-B along the protostellar outflow cavity, the compactness of their 1.3-mm continuum emission, and the properties of the associated CO emission suggest that these two sources trace outflow features due to shocks along the cavity wall, rather than protostellar objects. While it was considered as one of the best examples of a close protobinary system so far, the present analysis suggests that the prototypical Class 0, VLA1623, is single on the scales a > 100 AU probed by our SMA observations. Moreover, we present here the second robust case of compact millimeter continuum emission produced by interactions between the protostellar jet and the envelope of a Class 0 protostar, which suggests a high occurrence of these outflow features during the embedded phase.