利用Mileura宽场阵低频演示场原型系统探测蟹状星云巨脉冲
Detection of Crab Giant Pulses Using the Mileura Widefield Array Low Frequency Demonstrator Field Prototype System
摘要：
我们报告的巨型脉冲从蟹状星云脉冲星的频率为200 MHz的现场部署系统设计的Mileura宽场阵列的低频演示（MWA-LFD）的检测。我们的观测结果是在如此低的频率下进行的第一次高质量检测。测量的脉冲形状的星际脉冲展宽，产生的脉冲展宽时间为670 $\pm$ 100 $μ$ s，和隐含的散射强度（散射措施）是最低的，估计对蟹状星云的观测到目前为止。该系统的灵敏度主要取决于天空背景，我们的简单设备能够检测到振幅比$\sim$ 9 kJ亮的脉冲。在我们的数据中检测到的最亮的巨脉冲的峰值幅度为$\sim$ 50 kJ y，隐含的亮度温度为$10^{31.6}$ K。讨论了全MWA-LFD系统探测巨脉冲的前景。整个系统的灵敏度比原型设备高出两个数量级，能够探测到银河系范围很广的这种明亮的巨脉冲;根据频率，从$\sim$ 8到$\sim$ 30千秒差距。因此，MWA-LFD将是一个非常有前途的仪器，用于研究巨脉冲和其他快速无线电瞬态在低频。
英文摘要：
We report on the detection of giant pulses from the Crab Nebula pulsar at a frequency of 200 MHz using the field deployment system designed for the Mileura Widefield Array's Low Frequency Demonstrator (MWA-LFD). Our observations are among the first high-quality detections at such low frequencies. The measured pulse shapes are deconvolved for interstellar pulse broadening, yielding a pulse-broadening time of 670$\pm$100 $μ$s, and the implied strength of scattering (scattering measure) is the lowest that is estimated towards the Crab nebula from observations made so far. The sensitivity of the system is largely dictated by the sky background, and our simple equipment is capable of detecting pulses that are brighter than $\sim$9 kJy in amplitude. The brightest giant pulse detected in our data has a peak amplitude of $\sim$50 kJy, and the implied brightness temperature is $10^{31.6}$ K. We discuss the giant pulse detection prospects with the full MWA-LFD system. With a sensitivity over two orders of magnitude larger than the prototype equipment, the full system will be capable of detecting such bright giant pulses out to a wide range of Galactic distances; from $\sim$8 to $\sim$30 kpc depending on the frequency. The MWA-LFD will thus be a highly promising instrument for the studies of giant pulses and other fast radio transients at low frequencies.
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