Parkes observations for project P1411 semester 2026APRS_04

Conventional blind pulsar surveys that search for periodic signals in high-time-resolution data are increasingly limited by interstellar scattering at high dispersion measure (DM), orbital modulation in compact binaries, scintillation effects, and intensive computational demands. The Australian Square Kilometre Array Pathfinder (ASKAP) Evolutionary Map of the Universe (EMU) survey provides ultra-deep radio continuum maps enabling complementary image-domain pulsar searches that bypass these limitations. We have discovered seven new pulsars through three targeted strategies: (1) identifying compact sources embedded in supernova remnants (SNRs) and pulsar wind nebulae (PWNe), (2) detecting highly variable sources via variance imaging, and (3) selecting highly circularly polarised compact sources. Our sample includes three highly scattered pulsars (PSR J1638-4713 , PSR J1643-4511, and PSR J1631-4722 with DM > 800 pc/cm^3) including two pulsars associated with PWNe. Two millisecond pulsars (PSR J0927-7641 and PSR J1838-5949) are in potential wide binary systems with orbital periods of several tens of days, and two additional normal pulsars (PSR J1153-7106 and PSR 2223-0654). We propose follow-up timing observations of these pulsars with Murriyang's Ultra-Wideband Low (UWL) receiver to obtain phase-connected timing solutions, measure precise positions and spin parameters, and determine orbital characteristics for the binary systems,. These observations will enable studies of pulsar formation mechanisms, binary evolution pathways, PWN-SNR interactions, and validate image-based discovery techniques as powerful complements to traditional blind surveys for detecting elusive pulsars.

传统的盲搜索脉冲星巡天——即在高时间分辨率数据中搜寻周期性信号的巡天方式——正日益受到多重因素的限制：高色散量（dispersion measure, DM）下的星际散射、密近双星的轨道调制、闪烁效应，以及高昂的计算开销。澳大利亚平方千米阵列探路者（Australian Square Kilometre Array Pathfinder, ASKAP）的宇宙演化地图（Evolutionary Map of the Universe, EMU）巡天项目可提供超深射电连续谱成像，从而支持能够规避上述局限的成像域脉冲星搜寻方案。我们通过三类靶向策略发现了7颗新脉冲星：（1）识别嵌入超新星遗迹（supernova remnants, SNRs）与脉冲星风云（pulsar wind nebulae, PWNe）中的致密源；（2）通过方差成像（variance imaging）搜寻高变源；（3）选取高圆偏振致密源。我们的样本包含3颗强散射脉冲星（DM>800 pc/cm³的PSR J1638-4713、PSR J1643-4511与PSR J1631-4722），其中2颗与脉冲星风云相关联。2颗毫秒脉冲星（millisecond pulsars）——PSR J0927-7641与PSR J1838-5949——处于潜在的宽双星系统中，轨道周期为数十天；另有2颗常规脉冲星：PSR J1153-7106与PSR 2223-0654。我们提议使用穆里扬（Murriyang）的超宽带低频段（Ultra-Wideband Low, UWL）接收机对这批脉冲星开展后续计时观测，以获取相位连接计时解（phase-connected timing solutions）、精确测定其位置与自转参数，并确定双星系统的轨道特性。此类观测将支撑脉冲星形成机制、双星演化路径、脉冲星风云-超新星遗迹相互作用等相关研究，并验证成像搜寻技术作为传统盲巡天的有力补充，可用于探测难以被传统方法发现的脉冲星。