在大麦云星云中发现来自Sanduleak恒星的巨大高度准直喷流
Discovery of a giant, highly-collimated jet from Sanduleak's star in the Large Magellanic Cloud
摘要：
高度准直的气体喷射是宇宙中最引人注目的结构之一，被观察到来自非常不同的天体物理系统-从活动星系核到年轻的棕矮星。即使空间尺度跨度很大，也有令人信服的证据表明，这种现象的物理起源，即加速和准直机制，在所有类别的喷流中都是相同的。在这里，我们报告了一个巨大的，高度准直喷流的发现，从桑杜莱克的恒星在大麦云（LMC）。在大麦哲伦星系的距离上，它的物理范围为14秒差距，代表了有史以来发现的最大的恒星喷流，也是第一个在银河系之外解析的恒星喷流。Sanduleak恒星喷出物的运动学和极端化学成分与SN 1987 A的低速残余物以及最着名的超新星祖先候选者的外部细丝非常相似，即，船底座四号此外，对喷流距离的精确了解意味着有可能对喷流的大多数物理性质进行精确估计。因此，Sanduleak的双极外流将成为未来天体物理喷流理论建模的关键试验台。
英文摘要：
Highly-collimated gas ejections are among the most dramatic structures in the Universe, observed to emerge from very different astrophysical systems - from active galactic nuclei down to young brown dwarf stars. Even with the huge span in spatial scales, there is convincing evidence that the physics at the origin of the phenomenon, namely the acceleration and collimation mechanisms, is the same in all classes of jets. Here we report on the discovery of a giant, highly-collimated jet from Sanduleak's star in the Large Magellanic Cloud (LMC). With a physical extent of 14 parsecs at the distance of the LMC, it represents the largest stellar jet ever discovered, and the first resolved stellar jet beyond the Milky Way. The kinematics and extreme chemical composition of the ejecta from Sanduleak's star bear strong resemblance with the low-velocity remnants of SN1987A and with the outer filaments of the most famous supernova progenitor candidate, i.e., eta Carinae. Moreover, the precise knowledge of the jet's distance implies that it will be possible to derive accurate estimates of most of its physical properties. Sanduleak's bipolar outflow will thus become a crucial test-bed for future theoretical modeling of astrophysical jets.
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