Pulsar scintillation studies with LOFAR III. Annual variations in PSR~J0814$+$7429
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| Format: | Preprint |
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2026
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| author | Cai, Yanqing Wu, Ziwei Zhu, Weiwei Verbiest, Joris P. W. Liu, Yulan Ambalappat, Krishnakumar Moochickal Brüggen, Marcus Ciardi, Benedetta Dettmar, Ralf-Jürgen Fang, Ziyao Fu, Qiuyang Hoeft, Matthias Jin, Jiawei Künkel, Lars Künsemöller, Jörn Liu, Caisong Meng, Lingqi Miao, Xueli Niu, Jiarui Rejep, Rukiya Schwarz, Dominik J. Shaifullah, Golam M. Tiburzi, Caterina Vocks, Christian Wucknitz, Olaf Xue, Mengyao Yuan, Mao Yue, Youling Zhang, Chunfeng Zhang, Zhen |
| author_facet | Cai, Yanqing Wu, Ziwei Zhu, Weiwei Verbiest, Joris P. W. Liu, Yulan Ambalappat, Krishnakumar Moochickal Brüggen, Marcus Ciardi, Benedetta Dettmar, Ralf-Jürgen Fang, Ziyao Fu, Qiuyang Hoeft, Matthias Jin, Jiawei Künkel, Lars Künsemöller, Jörn Liu, Caisong Meng, Lingqi Miao, Xueli Niu, Jiarui Rejep, Rukiya Schwarz, Dominik J. Shaifullah, Golam M. Tiburzi, Caterina Vocks, Christian Wucknitz, Olaf Xue, Mengyao Yuan, Mao Yue, Youling Zhang, Chunfeng Zhang, Zhen |
| contents | The interstellar scintillation observed in radio pulsars arises from interference between electromagnetic waves scattered by electron density fluctuations in the turbulent interstellar plasma, providing a critical tool for probing the small-scale structure of the ionized interstellar medium and the pulsar system itself. The primary aim of this work is to study long-term scintillation variations for a bright and nearby pulsar, PSR J0814$+$7429, carried out from 2013 September to 2023 September with the LOw-Frequency ARray (LOFAR) High Band Antennae in the frequency range of 120 - 170 MHz. We derive the basic scintillation parameters, scintillation bandwidth ($Δν_{\rm d}$) and scintillation timescale ($Δτ_{\rm d}$), from the two-dimensional (2D) auto-covariance function of the dynamic spectra that are a 2D matrix of pulse intensity as a function of time and frequency. We present the long-term monitoring of $Δν_{\rm d}$ and $Δτ_{\rm d}$ for PSR J0814$+7429$, which shows a strong annual variation in the time series of the $Δτ_{\rm d}$. From our modeling of the annual variations of scintillation velocities, the scattering screen is anisotropic and located at $0.23\pm0.02$ kpc from the Earth, likely corresponding to the boundary of the Local Bubble. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02681 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Pulsar scintillation studies with LOFAR III. Annual variations in PSR~J0814$+$7429 Cai, Yanqing Wu, Ziwei Zhu, Weiwei Verbiest, Joris P. W. Liu, Yulan Ambalappat, Krishnakumar Moochickal Brüggen, Marcus Ciardi, Benedetta Dettmar, Ralf-Jürgen Fang, Ziyao Fu, Qiuyang Hoeft, Matthias Jin, Jiawei Künkel, Lars Künsemöller, Jörn Liu, Caisong Meng, Lingqi Miao, Xueli Niu, Jiarui Rejep, Rukiya Schwarz, Dominik J. Shaifullah, Golam M. Tiburzi, Caterina Vocks, Christian Wucknitz, Olaf Xue, Mengyao Yuan, Mao Yue, Youling Zhang, Chunfeng Zhang, Zhen High Energy Astrophysical Phenomena The interstellar scintillation observed in radio pulsars arises from interference between electromagnetic waves scattered by electron density fluctuations in the turbulent interstellar plasma, providing a critical tool for probing the small-scale structure of the ionized interstellar medium and the pulsar system itself. The primary aim of this work is to study long-term scintillation variations for a bright and nearby pulsar, PSR J0814$+$7429, carried out from 2013 September to 2023 September with the LOw-Frequency ARray (LOFAR) High Band Antennae in the frequency range of 120 - 170 MHz. We derive the basic scintillation parameters, scintillation bandwidth ($Δν_{\rm d}$) and scintillation timescale ($Δτ_{\rm d}$), from the two-dimensional (2D) auto-covariance function of the dynamic spectra that are a 2D matrix of pulse intensity as a function of time and frequency. We present the long-term monitoring of $Δν_{\rm d}$ and $Δτ_{\rm d}$ for PSR J0814$+7429$, which shows a strong annual variation in the time series of the $Δτ_{\rm d}$. From our modeling of the annual variations of scintillation velocities, the scattering screen is anisotropic and located at $0.23\pm0.02$ kpc from the Earth, likely corresponding to the boundary of the Local Bubble. |
| title | Pulsar scintillation studies with LOFAR III. Annual variations in PSR~J0814$+$7429 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2604.02681 |