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arXiv 1108.0401astro-ph.CO
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矮不规则星系IC10的深射电连续成像：追踪恒星形成和磁场

Deep Radio Continuum Imaging of the Dwarf Irregular Galaxy IC10: Tracing Star Formation and Magnetic Fields

Volker Heesen, Urvashi Rau, Michael Rupen, Elias Brinks, Deirdre A. Hunter

备注：
15 pages, 5 figures, accepted for publication in the EVLA Special Issue of ApJ Letters
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摘要：

我们利用扩展甚大阵列（EVLA）的灵敏度大大增加，研究后星暴，矮不规则星系IC 10在6厘米，线性分辨率为~50 pc的无线电连续谱和偏振特性。我们发现密切的协议之间的无线电连续和Halpha发射，从最亮的HII区域较弱的排放在磁盘上。定量分析显示出严格的线性相关性，其中热成分占总射电辐射的50%，其余部分是由于非热成分，其射电光谱指数在-0.7和-1.0之间，表明宇宙射线电子的辐射损失很大。我们确认并清楚地解决了偏振发射在10-20%的水平与非热超泡，其中有序的磁场可能是由于压缩膨胀的气泡增强。一小部分宇宙射线电子可能已经逃逸，因为测量到的无线电发射比Halpha推断的SFR所建议的低3倍。

英文摘要：

We exploit the vastly increased sensitivity of the Expanded Very Large Array (EVLA) to study the radio continuum and polarization properties of the post-starburst, dwarf irregular galaxy IC10 at 6 cm, at a linear resolution of ~50 pc. We find close agreement between radio continuum and Halpha emission, from the brightest HII regions to the weaker emission in the disk. A quantitative analysis shows a strictly linear correlation, where the thermal component contributes 50% to the total radio emission, the remainder being due to a non-thermal component with a surprisingly steep radio spectral index of between -0.7 and -1.0 suggesting substantial radiation losses of the cosmic-ray electrons. We confirm and clearly resolve polarized emission at the 10-20% level associated with a non-thermal superbubble, where the ordered magnetic field is possibly enhanced due to the compression of the expanding bubble. A fraction of the cosmic-ray electrons has likely escaped because the measured radio emission is a factor of 3 lower than what is suggested by the Halpha inferred SFR.

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