AI 中文总结
介绍SPOTLIGHT的脉冲星搜索组件，其为uGMRT上的GPU加速通用后端。开发基于FFT的可扩展搜索管道，结合多种技术。经估计可发现约450颗新脉冲星，管道已验证，展示了通用脉冲星调查潜力，是SKA时代相关搜索先驱。
AI 中文摘要
我们展示了SPOTLIGHT（通过升级后的巨米波射电望远镜（uGMRT）上的通用多波束GPU驱动的HPC进行零星射电暴调查）的脉冲星搜索组件，这是一个在uGMRT运行的GPU加速通用后端。它主要用于快速射电暴（FRB）的实时检测和定位，同时记录用于周期性搜索的波束形成数据子集，无需专门的望远镜时间。为处理调查产生的大量数据，我们开发了基于FFT的可扩展脉冲星搜索管道，结合了射频干扰缓解、GPU加速去色散和周期性搜索、多波束候选筛选、高效折叠及机器学习分类。通过总体合成和uGMRT存档观测估计，一个完全运行的具有160个PC和一个IA波束的SPOTLIGHT调查在三年半的通用观测中可发现约450颗新脉冲星，探测高天空覆盖率和微弱脉冲星。该管道已在GMRT第48和49周期观测中得到验证，成功重新检测到许多具有不同周期、色散量和通量密度的已知脉冲星，目前用于SPOTLIGHT通用数据处理。我们描述了SPOTLIGHT观测系统、脉冲星调查设计、搜索参数空间、候选选择策略、当前状态和未来发展。SPOTLIGHT展示了通用脉冲星调查的科学潜力，是SKA时代实时、大规模脉冲星和瞬态搜索的先驱。
英文摘要
We present the pulsar search component of SPOTLIGHT (Survey for sPoradic radiO bursTs via a commensaL multI-beam Gpu-powered Hpc at the gmrT), a GPU-accelerated commensal backend operating at the upgraded Giant Metrewave Radio Telescope (uGMRT). While SPOTLIGHT is primarily designed for real-time detection and localisation of fast radio bursts (FRBs), it simultaneously records a subset of beamformed data products for periodicity searches without requiring dedicated telescope time. To process the large data volumes generated by the survey, we have developed a scalable FFT-based pulsar search pipeline that combines radio-frequency interference mitigation, GPU-accelerated dedispersion and periodicity searches, multi-beam candidate sifting, efficient folding and machine-learning classification. Using population synthesis and archival uGMRT observations, we estimate that a fully operational SPOTLIGHT survey with 160 PC and one IA beam could discover $\sim$ 450 new pulsars, probing both high-sky coverage and faint pulsars over three and a half years of commensal observations. The pipeline has been validated on GMRT Cycle 48 and 49 observations (i.e. April 2025 to Mar 2026), successfully re-detecting numerous known pulsars with a wide range of Period, DM and flux densities, and is currently operational for SPOTLIGHT commensal data processing. We describe the SPOTLIGHT observing system, pulsar survey design, search parameter space, candidate-selection strategy, current status, and future developments. SPOTLIGHT demonstrates the scientific potential of commensal pulsar surveys and serves as a pathfinder for real-time, large-scale pulsar and transient searches in the SKA era.
Comments15 pages and 8 figures; Submitted to Astrophysical Journal (ApJ)
