Work

Searching for pulsars in Globular Clusters with the Fast Fold Algorithm and a new pulsar discovered in M13

Year: 2025

Type: preprint

Abstract: We employed the Fast Folding Algorithm (FFA) on L-Band Globular Cluster (GC) observations taken with Five-hundred-meter Aperture Spherical radio Telescope (FAST) to search for new pulsars, especially those with a long rotational period. We conducted a search across 16 GCs that collectively host 93 known pulsars, as well as 14 GCs that do not contain any known pulsars. The majority of these known pulsars were successfully re-detected in our survey. The few non-detections could be attributed to the high accelerations of these pulsars. Additionally, we have discovered a new binary millisecond pulsar, namely M13I (or PSR J1641+3627I) in GC M13 (or NGC 6205), and obtained its phase-coherent timing solution using observations spanning 6 years. M13I has a spin period of 6.37 ms, and an orbital period of 18.23 days. The eccentricity of the binary orbit is 0.064, with a companion mass range of approximately 0.45 to 1.37 M$_{\odot}$. The orbital properties of M13I are remarkably different from those of the other known pulsars in M13, indicating that this pulsar has undergone a different evolutionary path compared to the rest.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2505.05021

Authors: Li, Yaowei, Wang, Lin, Qian, Lei, Zhang, Liyun, Chen, Yujie, Yin, Dejiang, Li, Baoda, Dai, Yinfeng, Eatough, Ralph P., Li, Wenze, Jiang, Dongyue, Zhang, Xingnan, Li, Minghui, Lian, Yujie, Wu, Yuxiao, Liu, Tong, Liu, Kuo, Pan, Zhichen

Institutions: Chinese Academy of Sciences, Peking University, Shanghai Astronomical Observatory, Guizhou University, Max Planck Institute for Radio Astronomy, National Astronomical Observatories, Beijing Normal University, Chongqing University of Posts and Telecommunications

Language: English

Topic: Pulsars and Gravitational Waves Research

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, Chinese Academy of Sciences, China Postdoctoral Science Foundation, Youth Innovation Promotion Association of the Chinese Academy of Sciences, Peking University, Youth Innovation Promotion Association, National Astronomical Observatories, Chinese Academy of Sciences, Science and Technology Program of Guizhou Province

Awards: G1119317409, G2206054426, G2393958023, G2564517945, G2603782336, G2754047451, 基于深度学习的FAST主动反射面优化研究, G4902762503, G5665470415, G7103194975, G7289616065, G8836759699

OpenAlex ID: W4417084232

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