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arXiv 0902.1101astro-ph.SR
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T Tau三重态[ NeII ]发射的流出源

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

R. van Boekel, M. Guedel, Th. Henning, F. Lahuis, E. Pantin

摘要:

(Note:这是原“结构化”(A&A格式)摘要的缩短版本。)12.81微米[NeII]线最近获得了兴趣作为一个潜在的示踪气体在稀薄的表面层的拱星盘。斯皮策太空望远镜已经在许多年轻恒星中发现了这条线,但这些观测既没有空间上也没有光谱上解决[NeII]发射,使发射机制的性质不清楚。已经提出了在X射线照射的磁盘表面的起源和起源在强,解离冲击。我们已经进行了高空间和光谱分辨率(0.4 arcsec,R=30000)的T Tau三重态的研究。这个系统包含三颗年轻的恒星,至少有一个强X射线源(T Tau N),以及围绕系统的冲击气体扩散区域,范围为几角秒。我们发现,[NeII]发射的主要成分集中在T Tau S上,空间范围约为1.1角秒,比T Tau S中的圆盘大得多。我们检测到空间扩展的红移发射西北的系统和微弱的蓝移发射的SE,我们与N-S流出T头S。只有一小部分的[NeII]发射似乎是直接相关的X射线明亮的北方组成部分。我们建议[NeII]发射的射流作为一个主要因素,导致所观察到的大散射的X射线光度与[NeII]光度关系。我们认为T Tau S是T Tau“NW-blob”的驱动源。

英文摘要:

(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"

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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