Identifying the source of perytons at the Parkes radio telescope
Identifying the source of perytons at the Parkes radio telescope
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DOI：
10.1093/mnras/stv1242
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发表时间：
2015-08-21
影响因子：
4.8
通讯作者：
Bhandari, S.
中科院分区：
文献类型：
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作者：
Petroff, E.;Keane, E. F.;Bhandari, S.
“佩里顿”是地球起源的毫秒持续时间的瞬变，其扫频发射模拟了通过稀薄冷等离子体传播的天体物理脉冲的色散。事实上，它们与FRB 010724的相似性之前给“快速射电暴”（FRB）的解释蒙上了阴影，否则它似乎是银河系外的起源。到目前为止，色散模仿佩里顿的物理起源仍然是一个谜。我们已经确定了强烈的带外发射在2.3-2.5 GHz与几个佩里顿事件。随后的测试表明，当微波炉门过早打开时，望远镜处于适当的相对角度时，可以在1.4 GHz产生佩里顿。在磁控管关闭阶段，微波炉中逸出的无线电辐射巧妙地解释了佩里顿信号的所有观测特性。既然佩里顿源已经确定，我们进一步证明现场的微波炉不可能引起FRB 010724。这一点和其他明显的观测差异表明，FRB是真正的河外瞬变的绝佳候选者。
'Perytons' are millisecond-duration transients of terrestrial origin, whose frequency-swept emission mimics the dispersion of an astrophysical pulse that has propagated through tenuous cold plasma. In fact, their similarity to FRB 010724 had previously cast a shadow over the interpretation of 'fast radio bursts' (FRBs), which otherwise appear to be of extragalactic origin. Until now, the physical origin of the dispersion-mimicking perytons had remained a mystery. We have identified strong out-of-band emission at 2.3-2.5 GHz associated with several peryton events. Subsequent tests revealed that a peryton can be generated at 1.4 GHz when a microwave oven door is opened prematurely and the telescope is at an appropriate relative angle. Radio emission escaping from microwave ovens during the magnetron shut-down phase neatly explains all of the observed properties of the peryton signals. Now that the peryton source has been identified, we furthermore demonstrate that the microwave ovens on site could not have caused FRB 010724. This and other distinct observational differences show that FRBs are excellent candidates for genuine extragalactic transients.