Parkes observations for project P1141 semester 2021OCTS_05

Radio giant pulses (GPs) have been observed since the discovery of the Crab pulsar more than 50 years ago. Nevertheless the origins of this apparently irregular form of radio emission are still not understood. While their characteristics indicate the existence of a coherent emission mechanism, the search for an incoherent emission component via multi-wavelength correlation studies provides one way to identify potential emission regions in the magnetosphere of the pulsar. With the present proposal, we address the radio GP emission from PSR J0540-6919 (the Crab twin) and seek to search for a correlation with its X-ray emission. A recent study of this kind for the Crab pulsar proved to be successful (Enoto et al.\,2021). Our proposed study is to the best of our knowledge the first of its kind together with the Neutron Star Interior Composition ExploreR (NICER) for this particular source and will shed light on the question of whether correlations with X-ray emission are a characteristic of ordinary pulsars with radio GP emission. Such knowledge will be useful in unraveling whether there are different populations of radio GPs in the case of ordinary and millisecond pulsars.

射电巨脉冲（radio giant pulses, GPs）自50多年前蟹状星云脉冲星（Crab pulsar）被发现以来便已被观测到。然而，这种看似无规则的射电辐射的起源至今仍未得到阐明。尽管其辐射特性表明存在相干辐射机制（coherent emission mechanism），但通过多波段关联研究搜寻非相干辐射成分（incoherent emission component），仍是识别脉冲星磁层（magnetosphere）内潜在辐射区域的途径之一。基于本研究提案，我们将针对PSR J0540-6919（蟹状星云脉冲星的孪生体）的射电巨脉冲辐射展开研究，并探寻其与X射线辐射的关联。此前针对蟹状星云脉冲星的同类研究已取得成功（Enoto等人，2021）。据我们所知，本拟开展的研究是首次结合中子星内部组成探测器（Neutron Star Interior Composition ExploreR, NICER）针对该源展开的同类研究，将有助于阐明：拥有射电巨脉冲辐射的普通脉冲星，其辐射是否普遍存在与X射线辐射的关联。该研究成果将有助于厘清普通脉冲星与毫秒脉冲星（millisecond pulsars）是否存在不同的射电巨脉冲辐射族群。