用甚长基线射电干涉测量探测天鹅座X射线双星X-3的行为
Probing the behaviour of the X-ray binary Cygnus X-3 with very-long-baseline radio interferometry
摘要：
为了测试最近提出的分类的无线电/X射线状态的X射线二进制天鹅X-3，我们提出了一个分析的无线电数据可用于系统在更高的空间分辨率比用于定义的状态。无线电数据集包括5或15 GHz的VLBA存档数据和5 GHz的新e-EVN数据。我们还提出了5 GHz的MERLIN观测天鹅座X-3的爆发。在X射线制度，我们使用准同步与无线电，监测和指向RXTE观测。我们发现，当从喷流和核心的无线电发射是全球性的考虑，天鹅座X-3在毫弧秒尺度的行为是一致的，在弧秒尺度描述。然而，当无线电发射在核心组件和喷流组件中被解开时，情况发生了变化。很明显，在活跃状态下，来自喷流的无线电发射占主导地位。这表明，在这些状态下，总的无线电通量不能被用作吸积状态的直接示踪剂。
英文摘要：
In order to test the recently proposed classification of the radio/X-ray states of the X-ray binary Cyg X-3, we present an analysis of the radio data available for the system at much higher spatial resolutions than used for defining the states. The radio data set consists of archival VLBA data at 5 or 15 GHz and new e-EVN data at 5 GHz. We also present 5 GHz MERLIN observations of an outburst of Cyg X-3. In the X-ray regime we use quasi-simultaneous with radio, monitoring and pointed RXTE observations. We find that when the radio emission from both jet and core is globally considered, the behaviour of Cyg X-3 at milliarcsecond scales is consistent with that described at arcsecond scales. However, when the radio emission is disentangled in a core component and a jet component the situation changes. It becomes clear that in active states the radio emission from the jet is dominating that from the core. This shows that in these states the overall radio flux cannot be used as a direct tracer of the accretion state.
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