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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.08291 |
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| _version_ | 1866910869907046400 |
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| author | Zhang, Lei Abbate, Federico Li, Di Possenti, Andrea Bailes, Matthew Ridolfi, Alessandro Freire, Paulo C. C. Ransom, Scott M. Zhang, Yong-Kun Guo, Meng Ni, Meng-Meng Hu, Jia-Le Feng, Yi Wang, Pei Zhang, Jie Zhi, Qi-Jun |
| author_facet | Zhang, Lei Abbate, Federico Li, Di Possenti, Andrea Bailes, Matthew Ridolfi, Alessandro Freire, Paulo C. C. Ransom, Scott M. Zhang, Yong-Kun Guo, Meng Ni, Meng-Meng Hu, Jia-Le Feng, Yi Wang, Pei Zhang, Jie Zhi, Qi-Jun |
| contents | Only one globular cluster (GC), 47 Tuc, has been found to contain intracluster medium, with an electron density 100 times higher than that of the ISM in its vicinity. The characteristics of this intracluster medium are closely related to GC evolution and the compact objects within. However, significant knowledge gaps remain regarding the ionized gas content of GCs, particularly in Galactic halo clusters. We carried out a polarization census of GC pulsars using MeerKAT and FAST. This first combined effort of observations from these two major radio telescopes resulted in high signal-to-noise ratio, full polarization pulse profiles for 43 pulsars in 8 GCs, doubling the number of rotation measures (RMs) known in these clusters. The accuracy of dispersion measures (DMs) was improved by a factor of 8 compared to previous publications. No intracluster medium was found, and at least two halo GCs showed more stringent upper limits on electron density than that detected in 47 Tuc. The surprising barrenness of GCs suggests effective gas removal mechanisms, such as strong winds from millisecond pulsars and/or ionizing radiation from post-AGB stars and young white dwarfs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_08291 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing Globular Cluster with MeerKAT and FAST: A Pulsar Polarization Census Zhang, Lei Abbate, Federico Li, Di Possenti, Andrea Bailes, Matthew Ridolfi, Alessandro Freire, Paulo C. C. Ransom, Scott M. Zhang, Yong-Kun Guo, Meng Ni, Meng-Meng Hu, Jia-Le Feng, Yi Wang, Pei Zhang, Jie Zhi, Qi-Jun High Energy Astrophysical Phenomena Only one globular cluster (GC), 47 Tuc, has been found to contain intracluster medium, with an electron density 100 times higher than that of the ISM in its vicinity. The characteristics of this intracluster medium are closely related to GC evolution and the compact objects within. However, significant knowledge gaps remain regarding the ionized gas content of GCs, particularly in Galactic halo clusters. We carried out a polarization census of GC pulsars using MeerKAT and FAST. This first combined effort of observations from these two major radio telescopes resulted in high signal-to-noise ratio, full polarization pulse profiles for 43 pulsars in 8 GCs, doubling the number of rotation measures (RMs) known in these clusters. The accuracy of dispersion measures (DMs) was improved by a factor of 8 compared to previous publications. No intracluster medium was found, and at least two halo GCs showed more stringent upper limits on electron density than that detected in 47 Tuc. The surprising barrenness of GCs suggests effective gas removal mechanisms, such as strong winds from millisecond pulsars and/or ionizing radiation from post-AGB stars and young white dwarfs. |
| title | Probing Globular Cluster with MeerKAT and FAST: A Pulsar Polarization Census |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2503.08291 |