毫秒脉冲星多频偏振脉冲波形的研究
A Study of Multi-frequency Polarization Pulse Profiles of Millisecond Pulsars
摘要：
我们提出了高信噪比，多频偏振脉冲轮廓的24毫秒的脉冲星，正在观察的一部分，帕克斯脉冲星定时阵列（PPTA）项目。使用10厘米/50厘米双波段接收机和20厘米多波束接收机的中心波束，在中心频率接近730、1400和3100兆赫的三个波段观测到了这些双星。对大约六年的观测进行了仔细的校准和总结，以产生高S/N剖面。这使我们能够研究各个剖面分量，特别是它们如何随频率演变。我们还识别以前未检测到的轮廓特征。对于许多脉冲星，我们表明，脉冲发射延伸几乎整个脉冲轮廓。脉冲分量宽度和分量分离随频率遵循复杂的演变;在某些情况下，这些参数随着频率的增加而增加，在其他情况下，它们随着频率的增加而减小。分布的偏振特性随频率的演变也是不平凡的。我们提供的证据表明，前和后光标一般具有较高的分数线极化比主脉冲。通过对所有三个观测波段的拟合，我们得到了每颗脉冲星的光谱指数和自转测度。正如所预期的那样，对于大多数双星，光谱遵循单一的幂律，位置角遵循$λ^2$关系。然而，对于一些微扰器，可以看到明显的偏差。我们还提出了相位分辨测量的光谱指数，分数线偏振和旋转措施。所有这些属性被示出在脉冲轮廓上系统地变化。
英文摘要：
We present high signal-to-noise ratio, multi-frequency polarization pulse profiles for 24 millisecond pulsars that are being observed as part of the Parkes Pulsar Timing Array (PPTA) project. The pulsars are observed in three bands, centred close to 730, 1400 and 3100 MHz, using a dual-band 10 cm/50 cm receiver and the central beam of the 20 cm multibeam receiver. Observations spanning approximately six years have been carefully calibrated and summed to produce high S/N profiles. This allows us to study the individual profile components and in particular how they evolve with frequency. We also identify previously undetected profile features. For many pulsars we show that pulsed emission extends across almost the entire pulse profile. The pulse component widths and component separations follow a complex evolution with frequency; in some cases these parameters increase and in other cases they decrease with increasing frequency. The evolution with frequency of the polarization properties of the profile is also non-trivial. We provide evidence that the pre- and post-cursors generally have higher fractional linear polarization than the main pulse. We have obtained the spectral index and rotation measure for each pulsar by fitting across all three observing bands. For the majority of pulsars, the spectra follow a single power-law and the position angles follow a $λ^2$ relation, as expected. However, clear deviations are seen for some pulsars. We also present phase-resolved measurements of the spectral index, fractional linear polarization and rotation measure. All these properties are shown to vary systematically over the pulse profile.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
