Murchison宽场阵观测PSR J0437-4715的低频特性
The low-frequency characteristics of PSR J0437-4715 observed with the Murchison Widefield Array
摘要：
我们报告的毫秒脉冲星PSR J 0437 -4715与默奇森宽场阵列（MWA）在192 MHz的频率检测。我们的观测结果表明，在时间和频率的脉冲强度的快速调制所产生的衍射闪烁效应在星际介质（ISM），以及突出的漂移强度最大值的时间-频率平面所产生的折射效应。我们的分析表明，散射屏位于距离太阳$\sim$ 80-120 pc的位置，与最近声称的屏幕更近（$\sim$ 10 pc）的说法不一致。与更高频率的数据从帕克斯的比较揭示了一个戏剧性的演变的脉冲轮廓与频率，与外部锥发射变得可比的强度，从核心和内部锥区域。除了展示MWA目前可能具有的高时间分辨率科学能力外，我们的观察结果还强调了对定时阵列毫秒脉冲星进行低频调查的潜力，这可能会通过ISM效应的准确表征提高纳赫兹引力波检测的灵敏度。
英文摘要：
We report on the detection of the millisecond pulsar PSR J0437-4715 with the Murchison Widefield Array (MWA) at a frequency of 192 MHz. Our observations show rapid modulations of pulse intensity in time and frequency that arise from diffractive scintillation effects in the interstellar medium (ISM), as well as prominent drifts of intensity maxima in the time-frequency plane that arise from refractive effects. Our analysis suggests that the scattering screen is located at a distance of $\sim$80-120 pc from the Sun, in disagreement with a recent claim that the screen is closer ($\sim$10 pc). Comparisons with higher frequency data from Parkes reveals a dramatic evolution of the pulse profile with frequency, with the outer conal emission becoming comparable in strength to that from the core and inner conal regions. As well as demonstrating high time resolution science capabilities currently possible with the MWA, our observations underscore the potential to conduct low-frequency investigations of timing-array millisecond pulsars, which may lead to increased sensitivity for the detection of nanoHertz gravitational waves via the accurate characterisation of ISM effects.
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