标题： 猎户座三重星T Tau中的[NeII]发射的外流起源 显示英文标题

标题： An outflow origin of the [NeII] emission in the T Tau triplet

摘要： （注意：这是原始“A&A格式”摘要的缩短版。） 近红外12.81微米[NeII]谱线最近引起了关注，因为它可能作为示踪剂来探测围绕恒星盘稀薄表面层中的气体。 通过斯皮策空间望远镜已经在许多年轻恒星上检测到了该谱线，但这些观测既没有空间分辨也没有光谱分辨[NeII]发射，使得发射机制的性质仍不清楚。有人提出这种发射可能起源于受到X射线辐射的盘面，也可能起源于强烈的解离激波。 我们对金牛座T三星系统进行了高空间和光谱分辨率（0.4弧秒，R=30000）的研究。该系统包含三颗有盘的年轻恒星，至少有一个强X射线源（金牛座T北），以及环绕系统的几弧秒尺度上的弥漫激波气体区域。 我们发现[NeII]发射的主要成分位于金牛座T南，并且其空间范围大约为1.1弧秒，这比金牛座T南的盘要大得多。我们在系统西北方向检测到扩展的红移发射，在东南方向检测到较弱的蓝移发射，我们将这些与金牛座T南的南北喷流联系起来。只有少量的[NeII]发射似乎直接与明亮的北部X射线源相关。 我们认为喷流中的[NeII]发射是造成X射线亮度与[NeII]亮度关系中观察到的大范围分散的主要因素之一。 我们认为金牛座T南是导致金牛座T“西北团块”的驱动源。 显示英文摘要

摘要： (Note: this is a shortened version of the original "structured" (A&A format) abstract.) The 12.81 micrometer [NeII] line has recently gained interest as a potential tracer of gas in the tenuous surface layers of circumstellar disks. The line has been detected using the Spitzer Space Telescope in many young stars, yet these observations neiter spatially nor spectrally resolve the [NeII emission, leaving the nature of the emission mechanism unclear. Both an origin in an X-ray irradiated disk surface and an origin in strong, dissociative shocks have been proposed. We have performed a high spatial and spectral resolution (0.4 arcsec, R=30000) study of the T Tau triplet. This system contains three young stars with disks, at least one strong X-ray source (T Tau N), and diffuse regions of shocked gas surrounding the system on a scale of a few arcseconds. We find that the dominant component of [NeII] emission is centered on T Tau S and has a spatial extent of approximately 1.1 arcseconds, which is much larger than the disks in T Tau S. We detect spatially extended red-shifted emission NW of the system and fainter blue-shifted emission to the SE, which we associate with the N-S outflow from T Tau S. Only a small fraction of the [NeII] emission appears to be directly related to the X-ray bright northern component. We propose [NeII] emission in jets as a major factor causing the observed large scatter in the X-ray luminosity vs. [NeII] luminosity relation. We argue that T Tau S is the driving source of the T Tau "NW-blob"