Arp220中的紧凑源分辨率和快速变率
Compact source resolution and rapid variability in Arp220
摘要：
本文给出了Arp 220致密射电源2 cm、3.6 cm和6 cm波段的多历元全球VLBI观测结果。我们解决了许多源和估计的大小，膨胀速度和源类。我们发现大多数源的属性是一致的，他们要么是射电超新星（SNe）或超新星遗迹（SNRs）。我们扩展的信噪比非常小的源的亮度-直径的关系，并认为这支持壳磁场内部放大的模型。我们还检测到一个可能的SN/SNR过渡对象的候选人和三个高度可变的来源，可能超光速运动（约4C）的喷气式功能附近快速变化的几乎静止的组件。这些神秘的源与最近在M82中发现的超光速源有相似之处，可能与活动星系核或新的射电源类（例如中等质量黑洞或微耀变体）有关。
英文摘要：
We present multi-epoch global VLBI observations at 2 cm, 3.6 cm and 6 cm of the compact radio sources in Arp220. We resolve many sources and estimate sizes, expansion velocities and source classes. We find most source properties are consistent with them being either radio supernovae (SNe) or supernova remnants (SNRs). We extend the luminosity-diameter relation for SNRs to very small sources and argue this supports models where shell magnetic fields are internally amplified. We also detect one probable SN/SNR transition object candidate and three highly variable sources with possible superluminal motion (approximately 4c) of jet-like features near rapidly varying almost stationary components. These enigmatic sources, which show similarities to the recently discovered superluminal source in M82, might be associated with an AGN or a new radio source class (e.g. intermediate-mass black holes or micro-blazars).
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