Parkes observations for project P995 semester 2018OCTS_15

We propose to perform observations of the very young pulsar PSR B0540–69 in the Large Magellanic Cloud to detect pulsed flux from this traditionally radio-quiet source. We are motivated to do so due to a relatively recent X-ray observation of a 36% change in its spin down rate, thought to be due to a state change in its magnetospheric processes. There is reason to believe this may be accompanied by an increase in pulsed flux, as has been seen in intermittent pulsar behaviour, for example. Additionally, PSR B0540–69 is known to emit giant pulses, one of only a small number of pulsars to do so. With the new Ultra Wideband Low-frequency (UWL) receiver system, we will be able to conduct the highest sensitivity observations of this source yet achieved at radio wavelengths. A successful detection of pulsed flux will provide important insight into the magnetospheric evolution and behaviour in this pulsar, and a better understanding of how its glitch behaviour may influence its emission. Even without such a detection, we will be able to study the giant pulse behaviour of PSR B0540–69 with unprecedented sensitivity.

本研究拟对大麦哲伦云（Large Magellanic Cloud）内的年轻脉冲星（pulsar）PSR B0540–69开展观测，旨在探测这一传统射电宁静源的脉冲辐射流量。本次观测的研究动机源于近期一项X射线观测结果：该脉冲星的自旋减速速率发生了36%的变化，学界普遍认为这一现象源于其磁层过程的状态转变。已有研究证据表明，此类状态转变可能伴随脉冲辐射流量的提升——例如在部分间歇脉冲星的观测中已观测到类似现象。此外，已知PSR B0540–69会辐射巨脉冲，此类具备巨脉冲辐射特性的脉冲星仅占已知脉冲星的极少数。借助全新的超宽带低频（Ultra Wideband Low-frequency, UWL）接收机系统，本研究将能够在射电波段开展该源迄今最高灵敏度的观测。若成功探测到脉冲辐射流量，将有助于深入阐明该脉冲星的磁层演化与活动机制，并进一步理解其自转突跳（glitch）行为对辐射特性的影响。即便未能探测到脉冲辐射流量，本研究仍将以前所未有的灵敏度开展对PSR B0540–69巨脉冲活动的研究。