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High-Resolution Radio Continuum Observations of Edge-on Spiral Galaxies

机译:边缘螺旋星系的高分辨率无线电连续谱观测

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Radio continuum emission at 20 cm has been observed in a sample of 16 edge-on galaxies, using the VLA in its A configuration. These galaxies were observed recently at lower resolution by Irwin et al., who found evidence for extraplanar disk-halo features in 15 of the 16 galaxies. Twelve of the galaxies are detected in the new high-resolution observations. Of these, only two, which were previously known Seyferts, show convincing evidence for AGNs. For six of the galaxies, we provide improved positions for the galaxy nuclei. In four galaxies, radio continuum loops extending perpendicular to the major axis have been discovered, confirming previous conclusions from lower resolution observations that extraplanar emission is present, as well as providing further evidence that radio "halos" consist, at least in part, of underlying discrete features. For several galaxies, the resolution is sufficient to reveal individual star-forming regions in the disk. We examine NGC 3556 in detail since this galaxy has been shown by King & Irwin to display extremely large H I supershells. The estimated input energy from supernovae in the brightest radio component of this galaxy is insufficient to drive the observed H I supershells. We explore possible resolutions to this energy deficit.
机译:使用A配置的VLA,在16个边缘对开星系的样本中已观察到20 cm处的连续辐射。 Irwin等人最近以较低的分辨率观察到了这些星系,他们发现了16个星系中的15个星系具有面外盘晕特征。在新的高分辨率观测中发现了十二个星系。其中只有两个,以前称为塞弗特(Seyferts),显示出令人信服的AGN证据。对于六个星系,我们为星系核提供了改进的位置。在四个星系中,已经发现了垂直于主轴线延伸的无线电连续回路,这证实了先前从低分辨率观测中得出的结论,即存在超平面发射,并提供了进一步的证据表明无线电“晕”至少部分地由下层构成。离散功能。对于几个星系,分辨率足以揭示盘中的各个恒星形成区域。我们将详细研究NGC 3556,因为King&Irwin已显示该星系显示出非常大的H I超壳。来自该星系最亮的无线电部分中超新星的估计输入能量不足以驱动观测到的H I超壳。我们探讨了解决这种能量不足的方法。

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