X射线暗孤立中子星射电辐射的新极限
New Limits on Radio Emission from X-ray Dim Isolated Neutron Stars
摘要：
我们用罗伯特·C.伯德格林班克射电望远镜。使用快速折叠，快速傅立叶变换，和单脉冲搜索没有发现瞬态或脉冲发射。对于脉冲发射，相应的通量极限约为0.01 mJy，这取决于特定源的积分时间，并假设占空比为2%，对于单个分散脉冲，相应的通量极限为20 mJy。这是迄今为止对X射线暗淡孤立中子星的射电辐射最敏感的极限。没有证据表明存在孤立的无线电脉冲，就像在一类被称为旋转无线电瞬变的中子星中看到的那样。我们的研究结果意味着，这些天体的射电光度要么低于任何已知的射电望远镜，要么它们可能只是长周期的附近射电望远镜，具有远离地球的高磁场。为了测试后一种可能性，我们需要大约40个类似的源，以提供其中至少一个向我们发射的1 sigma概率。我们还详细描述了我们的快速折叠算法的实现。
英文摘要：
We have carried out a search for radio emission at 820 MHz from six X-ray dim isolated neutron stars with the Robert C. Byrd Green Bank Radio Telescope. No transient or pulsed emission was found using fast folding, fast Fourier transform, and single-pulse searches. The corresponding flux limits are about 0.01 mJy for pulsed emission, depending on the integration time for the particular source and assuming a duty cycle of 2%, and 20 mJy for single dispersed pulses. These are the most sensitive limits to date on radio emission from X-ray dim isolated neutron stars. There is no evidence for isolated radio pulses, as seen in a class of neutron stars known as rotating radio transients. Our results imply that either the radio luminosities of these objects are lower than those of any known radio pulsars, or they could simply be long-period nearby radio pulsars with high magnetic fields beaming away from the Earth. To test the latter possibility, we would need around 40 similar sources to provide a 1 sigma probability of at least one of them beaming toward us. We also give a detailed description of our implementation of the Fast Folding Algorithm.
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