We present high signal-to-noise, full polarization pulse profiles for 40 bright, 'slowly'-rotating (non-recycled) pulsars using the new Ultra-Wideband Low-frequency (UWL; 704-4032 MHz) receiver on the Parkes radio telescope. We obtain updated and accurate interstellar medium parameters towards these pulsars (dispersion measures and Faraday rotation measures), and reveal Faraday dispersion towards PSR J1721-3532 caused by interstellar scattering. We find general trends in the pulse profiles including decreasing fractional linear polarization and increasing degree of circular polarization with increasing frequency, consistent with previous studies, while also revealing new features and frequency evolution. This demonstrates results that can be obtained using UWL monitoring observations of slow pulsars, which are valuable for improving our understanding of pulsar emission and the intervening interstellar medium. The calibrated data products are publicly available.
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)
The RRATalog: a Galactic census of rotating radio transients
West Virginia University(西弗吉尼亚大学);Center for Gravitational Waves and Cosmology, West Virginia University(西弗吉尼亚大学引力波与宇宙学中心);Shanghai Science and Technology Museum(上海科技馆);Center for KINETIC Plasma Physics, West Virginia University(西弗吉尼亚大学等离子体物理中心)
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)
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)
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)
Probing turbulence in the ionized interstellar medium using young pulsars. I. Dispersion measure variations
ASTRON, Netherlands Institute for Radio Astronomy(荷兰射电天文研究所);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);Max-Planck-Institut für Radioastronomie(马克斯·普朗克射电天文研究所);Australia Telescope National Facility, CSIRO(澳大利亚望远镜国家设施,CSIRO);LPC2E, OSUC, Univ Orleans, CNRS, CNES, Observatoire de Paris(奥尔良大学 LPC2E 实验室);Space Science Division, Naval Research Laboratory(海军研究局空间科学分部);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)