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arXiv 1209.5265astro-ph.CO
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五个蓝色致密矮星系[Ne v]辐射的探测

The detection of [Ne v] emission in five blue compact dwarf galaxies

Y. I. Izotov, T. X. Thuan, G. Privon

备注：
10 pages, 3 figures, accepted for publication in MNRAS
发表信息：
MNRAS, 2012, 427, 1229
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摘要：

我们报告发现的高电离[Ne v] 3426 A发射线的光谱中的五个蓝色致密矮（BCD）星系。加上之前已知的三个具有[Ne v]发射的BCD，这样的星系的整个样本现在包含八个物体。探测到这条线意味着存在强烈的硬电离辐射。这样的辐射不能用高质量X射线双星或大质量恒星星族的模型来重现。还需要其他机制，如活动星系核和/或快速辐射冲击。我们认为，快速辐射冲击是最有可能的机制。观测到的[Ne v] 3426/He ii 4686流量比在所有8个星系可以再现辐射激波模型与冲击速度在~300-500 km/s的范围内，和与冲击电离的贡献是~10%的恒星电离的贡献。然而，我们不能排除这10%的部分是由活动星系核产生的，而不是由辐射冲击产生的。

英文摘要：

We report the discovery of the high-ionisation [Ne v] 3426A emission line in the spectra of five blue compact dwarf (BCD) galaxies. Adding the three previously known BCDs with [Ne v] emission, the entire sample of such galaxies now contains eight objects. The detection of this line implies the presence of intense hard ionising radiation. Such radiation cannot be reproduced by models of high-mass X-ray binaries or massive stellar populations. Other mechanisms, such as AGN and/or fast radiative shocks, are needed. We consider that fast radiative shocks is the most likely mechanism. The observed [Ne v] 3426/He ii 4686 flux ratios in all eight galaxies can be reproduced by radiative shock models with shock velocities in the ~300-500 km/s range, and with the shock ionising contribution being ~10% of the stellar ionising contribution. However, we cannot rule out that this 10% part is produced by an AGN rather than by radiative shocks.

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