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arXiv 0802.3878astro-ph
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超新星遗迹中羟基的研究:1720 MHz脉泽辐射扩展的证据

A Survey of Hydroxyl Toward Supernova Remnants: Evidence for Extended 1720 MHz Maser Emission

J. W. Hewitt, F. Yusef-Zadeh, M. Wardle

摘要:

我们提出的GBT观测结果的所有四个基态的羟基(OH)过渡到15超新星遗迹(SNRs)显示OH(1720 MHz)脉泽发射。这类脉泽被公认为是SNR和致密分子物质之间持续相互作用的极好示踪剂。对于大多数这些对象,我们检测到显着更高的通量密度与一个单一的菜比已报道的干涉观测。我们推断,空间扩展,低电平脉泽发射是一种常见的现象,跟踪大尺度相互作用的脉泽发射信噪比。此外,我们使用碰撞泵浦模型来拟合的物理条件下,OH被激发背后的SNR冲击波阵面。我们发现,观测到的与SNR相互作用有关的OH气体的柱数小于每平方厘米10^17个,温度为20 ~ 125 K,密度为每立方厘米10^5个。

英文摘要:

We present the results of GBT observations of all four ground-state hydroxyl (OH) transitions toward 15 supernova remnants (SNRs) which show OH(1720 MHz) maser emission. This species of maser is well established as an excellent tracer of an ongoing interaction between the SNR and dense molecular material. For the majority of these objects we detect significantly higher flux densities with a single dish than has been reported with interferometric observations. We infer that spatially extended, low level maser emission is a common phenomenon that traces the large-scale interaction in maser-emitting SNRs. Additionally we use a collisional pumping model to fit the physical conditions under which OH is excited behind the SNR shock front. We find the observed OH gas associated with the SNR interaction having columns less than approximately 10^17 per square cm, temperatures of 20 to 125 K, and densities 10^5 per cubic cm.

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