The radio polarization properties of the pulsar population are only superficially captured by the conventional picture of pulsar radio emission. We study the broadband polarization of 271 young radio pulsars, focusing particularly on circular polarization, using high quality observations made with the Ultra-Wideband Low receiver on Murriyang, the Parkes radio telescope. We seek to encapsulate polarization behaviour on a population scale by defining broad categories for frequency- and phase-dependent polarization evolution, studying the co-occurrences of these categorizations and comparing them with average polarization measurements and spin-down energy ($\dot{E}$). This work shows that deviations of the linear polarization position angle (PA) from the rotating vector model (RVM) are linked to the presence of circular polarization features and to frequency evolution of the polarization. Polarization fraction, circular polarization contribution and profile complexity all evolve with $\dot{E}$ across the population, with the profiles of high-$\dot{E}$ pulsars being simple and highly linearly polarized. The relationship between polarization fraction and circular contribution is also seen to evolve such that highly polarized profiles show less variation in circular contribution with frequency than less strongly polarized profiles. This evolution is seen both across the population and across frequency for individual sources. Understanding pulsar radio polarization requires detailed study of individual sources and collective understanding of population-level trends. For the former, we provide visualizations of their phase- and frequency-resolved polarization parameters. For the latter, we have highlighted the importance of including the impact of circular polarization and of $\dot{E}$.
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）
A bright wideband radio burst from the isolated neutron star 2XMM J104608.7$-$594306
The University of Manchester（曼彻斯特大学）；The University of Oxford（牛津大学）；ASTRON, the Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）；Anton Pannekoek Institute, University of Amsterdam（阿姆斯特丹大学安东·潘内科克研究所）；Sydney Institute for Astronomy, School of Physics, The University of Sydney（悉尼大学物理学院天体物理学研究所）；ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)（引力波发现卓越研究中心）
A new fast radio burst in the datasets containing the Lorimer burst
利用Parkes 64 m口径射电望远镜的多波束接收机，在1.4GHz的麦哲伦云观测资料中，发现了一个新的快速射电暴（FRB~010312）。这些数据集包括洛里默爆发（FRB~010724），它早于日期，我们也重新检测。新的爆发具有更高的色散测量值1187 cm $^{-3}$ pc。该爆发是迄今为止发现的最广泛的爆发之一，是已知的第二早的FRB，也是第九个发现的分散测量值大于1000 cm $^{-3}\,$ pc的FRB。我们的发现表明，在现有的帕克斯数据档案中可能还有更多的爆发事件。
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）
