Single-Pulse Study of the Pseudo-nulling Pulsar PSR J1820-0509 Based on FAST Observations
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2026
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866911548041068544 |
|---|---|
| author | Tu, Zefeng Zhao, Rushuang Liu, Hui Gong, Biping Li, D. Wang, P. Miao, Chenchen Zhi, Q. J. Dang, S. J. Wang, S. D. Zhou, Q. Zhang, Z. J. Zhu, Xu Tian, R. W. Xu, H. W. Zhou, Yi Yan, D. Y. |
| author_facet | Tu, Zefeng Zhao, Rushuang Liu, Hui Gong, Biping Li, D. Wang, P. Miao, Chenchen Zhi, Q. J. Dang, S. J. Wang, S. D. Zhou, Q. Zhang, Z. J. Zhu, Xu Tian, R. W. Xu, H. W. Zhou, Yi Yan, D. Y. |
| contents | Using two observations obtained with the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we present a detailed single-pulse analysis of the high-nulling pulsar PSR J1820-0509. We measure an exceptionally high nulling fraction of approximately 81.78%, significantly exceeding previous estimates from Parkes observations. The single-pulse energy distribution exhibits a clear bimodal structure, consistent with classical nulling behavior. However, stacking the identified null pulses reveals a statistically significant residual profile above the noise level, indicating that the nulls correspond to a very weak emission state rather than a complete cessation of radio emission.
The pulsar shows clustered burst activities spanning several hundred rotation periods, with prominent quasi-periodicities at 1191 +/- 81 and 590 +/- 15 pulse periods in the two observations. Based on temporal clustering and integrated profile morphology, we identify three distinct emission modes (A, B, and C) and a pseudo-null state (D). These modes exhibit systematic differences in pulse morphology, polarization, and energy statistics. The pulse width-energy relations reveal clear transitions between low- and high-energy regimes. The energy distributions of Modes A and C are well described by lognormal functions, while Mode B follows a composite Gaussian-lognormal distribution.
These results suggest that the radio emission of PSR J1820-0509 is governed by multiple quasi-stable magnetospheric states. The presence of weak emission during pseudo-nulls, together with systematic mode-dependent variations, supports the interpretation that pulsar nulling reflects transitions between different magnetospheric activity levels rather than a complete shutdown of emission. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_26171 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Single-Pulse Study of the Pseudo-nulling Pulsar PSR J1820-0509 Based on FAST Observations Tu, Zefeng Zhao, Rushuang Liu, Hui Gong, Biping Li, D. Wang, P. Miao, Chenchen Zhi, Q. J. Dang, S. J. Wang, S. D. Zhou, Q. Zhang, Z. J. Zhu, Xu Tian, R. W. Xu, H. W. Zhou, Yi Yan, D. Y. High Energy Astrophysical Phenomena Using two observations obtained with the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we present a detailed single-pulse analysis of the high-nulling pulsar PSR J1820-0509. We measure an exceptionally high nulling fraction of approximately 81.78%, significantly exceeding previous estimates from Parkes observations. The single-pulse energy distribution exhibits a clear bimodal structure, consistent with classical nulling behavior. However, stacking the identified null pulses reveals a statistically significant residual profile above the noise level, indicating that the nulls correspond to a very weak emission state rather than a complete cessation of radio emission. The pulsar shows clustered burst activities spanning several hundred rotation periods, with prominent quasi-periodicities at 1191 +/- 81 and 590 +/- 15 pulse periods in the two observations. Based on temporal clustering and integrated profile morphology, we identify three distinct emission modes (A, B, and C) and a pseudo-null state (D). These modes exhibit systematic differences in pulse morphology, polarization, and energy statistics. The pulse width-energy relations reveal clear transitions between low- and high-energy regimes. The energy distributions of Modes A and C are well described by lognormal functions, while Mode B follows a composite Gaussian-lognormal distribution. These results suggest that the radio emission of PSR J1820-0509 is governed by multiple quasi-stable magnetospheric states. The presence of weak emission during pseudo-nulls, together with systematic mode-dependent variations, supports the interpretation that pulsar nulling reflects transitions between different magnetospheric activity levels rather than a complete shutdown of emission. |
| title | Single-Pulse Study of the Pseudo-nulling Pulsar PSR J1820-0509 Based on FAST Observations |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2603.26171 |