Pulsar radio emission and its polarization are observed to evolve with frequency. This frequency dependence is key to the emission mechanism and the structure of the radio beam. With the new Ultra-Wideband receiver (UWL) on the Parkes radio telescope we are able, for the first time, to observe how pulsar profiles evolve over a broad continuous bandwidth of 700-4000 MHz. We describe here a technique for processing broadband polarimetric observations to establish a meaningful alignment and visualize the data across the band. We apply this to observations of PSRs J1056-6258 and J1359-6038, chosen due to previously unresolved questions about the frequency evolution of their emission. Application of our technique reveals that it is possible to align the polarization position angle (PA) across a broad frequency range when constrained to applying only corrections for dispersion and Faraday rotation to do so. However, this does not correspond to aligned intensity profiles for these two sources. We find that it is possible to convert these misalignments into emission height range estimates that are consistent with published and simulated values, suggesting that they can be attributed to relativistic effects in the magnetosphere. We discuss this work in the context of the radio beam structure and prepare the ground for a wider study of pulsar emission using broadband polarimetric data.
Temporal Variations in Pulsar Spectro-Polarimetry: Findings from millisecond pulsar J2144-5237 using Parkes UWL receiver
National Centre for Radio Astrophysics, NCRA-TIFR（国家射电天文中心，NCRA-TIFR）；CSIRO Space and Astronomy（CSIRO空间与天文学部）；Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester（曼彻斯特大学物理与天文学系乔德雷克银行天体物理学中心）
Ultra-Wideband Polarimetry of the April 2021 Profile Change Event in PSR J1713+0747
Macquarie University（麦考瑞大学）；Australia Telescope National Facility, CSIRO（澳大利亚望远镜国家设施，CSIRO）；Xinjiang Astronomical Observatory, Chinese Academy of Sciences（中国科学院新疆天文台）；School of Physics and Astronomy, Monash University（蒙纳士大学物理与天文学学院）；Space Science Division, Naval Research Laboratory（海军研究实验室空间科学部）；Centre for Astrophysics and Supercomputing, Swinburne University of Technology（斯威本科技大学天体物理学与超级计算中心）
Frequency- and phase-resolved polarimetry of millisecond pulsars and its application to timing
Monash University（莫纳什大学）；OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery（ARC引力波发现卓越中心）；Australia Telescope National Facility, CSIRO（澳大利亚国家望远镜设施，CSIRO）；Xinjiang Astronomical Observatory, Chinese Academy of Sciences（中国科学院新疆天文台）；Max Planck Institute for Gravitational Physics (Albert Einstein Institute)（马克斯·普朗克引力物理学研究所（爱因斯坦研究所））；Leibniz Universität Hannover（汉诺威莱布尼茨大学）；Hunan Normal University（湖南师范大学）
Circularly polarized radio emission from the repeating fast radio burst source FRB 20201124A
产生快速射电暴（FRB）辐射的机制还知之甚少。有针对性地监测重复FRB源提供了机会，以一次性突发不可能的方式充分表征发射特性。在这里，我们报告了FRB 20201124 A源的观测结果，澳大利亚平方公里阵列探路者（ASKAP）和帕克斯64米射电望远镜（Murriyang）的超宽带低（UWL）接收器。该源在2021年4月初进入了一个发射明亮爆发的时期。我们已经探测到了16个来自这个源的爆发。ASKAP探测到的爆发之一是从重复FRB源观测到的最亮爆发，推断通量为$640\pm70$ μ ms。在Parkes UWL探测到的五个爆发中，没有一个显示出1.1- 4 GHz范围内的任何发射。所有的UWL爆发都是高度极化的，它们的法拉第旋转测量（RM）显示出明显的变化。我们得到了一个平均RM的$-614$ rad m $^{-2}$的FRB源的$16$ rad m $^{-2}$在UWL爆发的标准偏差。在其中一个UWL爆发中，我们看到了显著的圆偏振发射的证据，其分数范围为$47\pm1$ %。如此高的圆偏振度在重复FRB源的爆发中从未见过。我们还看到了在这个UWL重复突发脉冲轮廓中的线性偏振位置角的显著变化的证据。重复脉冲群发射的模型需要考虑脉冲群极化特性的多样性。
Discovery of Two Consecutive Profile Change Events in the Millisecond Pulsar PSR J0437-4715
Macquarie University（麦考瑞大学）；Australia Telescope National Facility, CSIRO（澳大利亚望远镜国家设施，CSIRO）；OzGrav: The ARC Center of Excellence for Gravitational Wave Discovery（OzGrav：ARC引力波发现卓越中心）；Xinjiang Astronomical Observatory, Chinese Academy of Sciences（中国科学院新疆天文台）；School of Physics and Astronomy, Monash University（蒙纳士大学物理与天文学学院）
Searching for links between energetic millisecond pulsars and repeating fast radio bursts
Anton Pannekoek Institute for Astronomy, University of Amsterdam（阿姆斯特丹大学安东·潘内科克天文学研究所）；ASTRON, Netherlands Institute for Radio Astronomy（荷兰射电天文研究所 ASTRON）；Department of Physics, McGill University（麦吉尔大学物理系）；Trottier Space Institute, McGill University（麦吉尔大学特罗蒂尔太空研究所）；Joint institute for VLBI ERIC（甚长基线干涉测量联合研究所 ERIC）；CSIRO Space and Astronomy, Australia Telescope National Facility（澳大利亚联邦科学与工业研究组织空间与天文部，澳大利亚望远镜国家设施）
Frequency evolution of pulsar emission: Further evidence for fan beam model
National Astronomical Research Institute of Thailand（泰国国家天文研究所）；Australia Telescope National Facility, CSIRO（澳大利亚望远镜国家设施，CSIRO）；Naval Research Laboratory（海军研究实验室）；Swinburne University of Technology（斯威本科技大学）；University of Southampton（南安普顿大学）；OzGrav: The ARC Centre of Excellence for Gravitational-wave Discovery（OzGrav：ARC引力波发现卓越中心）；SKAO（平方公里阵列射电望远镜）；CSIRO；The University of Manchester（曼彻斯特大学）
Vacuum birefringence and the polarized X-ray emission from a radio magnetar
George Washington University（乔治华盛顿大学）；Rice University（莱斯大学）；NASA Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）；University of Maryland Baltimore County（马里兰大学巴尔的摩县分校）；Swinburne University of Technology（斯威本科技大学）；Louisiana State University（路易斯安那州立大学）；South African Radio Astronomy Observatory（南非射电天文观测台）
