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A powerful bursting radio source towards the Galactic Centre

机译：通往银河系中心的强大无线电源

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摘要

Transient astronomical sources are typically powered by compact objects and usually signify highly explosive or dynamic events(1). Although high-time-resolution observations are often possible in radio astronomy(2), they are usually limited to quite narrow fields of view. The dynamic radio sky is therefore poorly sampled, in contrast to the situation in the X-ray and gamma-ray bands in which wide-field instruments routinely detect transient sources(3). Here we report a transient radio source, GCRT J1745 - 3009, which was detected during a moderately wide-field monitoring programme of the Galactic Centre region(4,5) at 0.33 GHz. The characteristics of its bursts are unlike those known for any other class of radio transient. If located in or near the Galactic Centre, its brightness temperature (, 10 16 K) and the implied energy density within GCRT J1745 - 3009 vastly exceed those observed in most other classes of radio astronomical sources(6), and are consistent with coherent emission processes(7) that are rarely observed. We conclude that it represents a hitherto unknown class of transient radio sources, the first of possibly many new classes that may be discovered by emerging wide-field radio telescopes(8).
机译：瞬态天文源通常由紧凑的物体提供动力，通常表示高度爆炸或动态事件（1）。尽管在射电天文学中经常可以进行高分辨率的观测（2），但它们通常仅限于相当狭窄的视野。因此，与动态宽广的仪器常规检测瞬态辐射源的X射线和γ射线波段的情况相比，动态无线电天空的采样效果较差（3）。在这里，我们报告了一个瞬时无线电源GCRT J1745-3009，它是在0.33 GHz的银河中心区域（4,5）进行的中等广域监视程序中检测到的。其突发的特征不同于其他任何类型的无线电瞬变已知的特征。如果位于银河系中心内或附近，其亮度温度（，10 16 K）和GCRT J1745-3009内的隐含能量密度大大超过大多数其他类别的射电天文源观测到的值（6），并且与相干发射一致很少观察到的过程（7）。我们得出的结论是，它代表了迄今未知的瞬态射电源类别，这是新兴的广域射电望远镜可能发现的许多新类别中的第一个（8）。

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