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arXiv 1009.0964astro-ph.HEastro-ph.CO
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年轻超新星晚期遗迹LMC中N132D的三维结构

The 3D Structure of N132D in the LMC: A Late-Stage Young Supernova Remnant

Frédéric Vogt, Michael A. Dopita

摘要:

我们利用塞丁泉天文台2.3米望远镜上的宽视场摄谱仪(WiFeS),绘制了大麦云云中年轻富氧超新星遗迹N132D的[O III] 5007 π动力学图。从由此产生的数据立方体,我们已经能够重建完整的三维结构的[O III]灯丝系统。大多数喷出物形成一个直径约为12pc的环,与视线成25度角。我们得出结论,SNR N132D在进入完全热化的Sedov演化阶段之前正在接近反向激波阶段的结束。我们推测,环的富氧物质来自喷出物在赤道平面的两极爆炸,和SNR的整体形状是强烈的影响前超新星质量损失的祖星。我们发现了极喷流与一个非常快速的富氧结相关的诱人证据,以及中央恒星与周围ISM中的一个或多个致密云相互作用的明确证据。

英文摘要:

We have used the Wide Field Spectrograph (WiFeS) on the 2.3m telescope at Siding Spring Observatory to map the [O III] 5007Å dynamics of the young oxygen-rich supernova remnant N132D in the Large Magellanic Cloud. From the resultant data cube, we have been able to reconstruct the full 3D structure of the system of [O III] filaments. The majority of the ejecta form a ring of ~12pc in diameter inclined at an angle of 25 degrees to the line of sight. We conclude that SNR N132D is approaching the end of the reverse shock phase before entering the fully thermalized Sedov phase of evolution. We speculate that the ring of oxygen-rich material comes from ejecta in the equatorial plane of a bipolar explosion, and that the overall shape of the SNR is strongly influenced by the pre-supernova mass loss from the progenitor star. We find tantalizing evidence of a polar jet associated with a very fast oxygen-rich knot, and clear evidence that the central star has interacted with one or more dense clouds in the surrounding ISM.

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