dorsal/arxiv
View SchemaDoes the radio-active phase of XTE~J1810$-$197 recur following the same evolutionary pattern?
| Authors | Zhipeng Huang, Zhen Yan, Zhiqiang Shen, Hao Tong, Mingyu Ge, Zhifu Gao, Yajun Wu, Rongbing Zhao, Jie Liu, Rui Wang, Xiaowei Wang, Fan Yang, Chuyuan Zhang, Zhenlong Liao, Yangyang Lin |
|---|---|
| Categories | |
| ArXiv ID | 2601.07173vv1 |
| URL | https://arxiv.org/abs/2601.07173 |
| License | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
Abstract
Magnetars are the most strongly magnetized compact objects known in the Universe and are regarded as one of the primary engines powering a variety of enigmatic, high-energy transients. However, our understanding of magnetars remains highly limited, constrained by observational sample size and radiative variability. XTE~J1810$-$197, which re-entered a radio-active phase in 2018, is one of only six known radio-pulsating magnetars. Leveraging the distinctive capability for simultaneous dual-frequency observations, we utilized the Shanghai Tianma Radio Telescope (TMRT) to monitor this magnetar continuously at both 2.25 and 8.60~GHz, capturing its entire evolution from radio activation to quenching. This enabled precise characterization of the evolution in its integrated profile, spin frequency, flux density, and spectral index ($\alpha$, defined by $S \propto f^{\alpha}$). The first time derivative of its spin frequency $\dot{\nu}$ passed through four distinct phases -- rapid decrease, violent oscillation, steady decline, and stable recovery -- before returning to its pre-outburst value concomitant with the cessation of radio emission. Remarkably, both the amplitudes and the characteristic time-scales of these $\dot{\nu}$ variations match those observed during the previous outburst that began in 2003, providing the first demonstration that post-outburst rotational evolution and radiative behavior in a magnetar are repeatable. A twisted-magnetosphere model can qualitatively account for this repeatability as well as for the progressive narrowing and abrupt disappearance of the radio pulse radiation, thereby receiving strong observational support.
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"abstract": "Magnetars are the most strongly magnetized compact objects known in the Universe and are regarded as one of the primary engines powering a variety of enigmatic, high-energy transients. However, our understanding of magnetars remains highly limited, constrained by observational sample size and radiative variability. XTE~J1810$-$197, which re-entered a radio-active phase in 2018, is one of only six known radio-pulsating magnetars. Leveraging the distinctive capability for simultaneous dual-frequency observations, we utilized the Shanghai Tianma Radio Telescope (TMRT) to monitor this magnetar continuously at both 2.25 and 8.60~GHz, capturing its entire evolution from radio activation to quenching. This enabled precise characterization of the evolution in its integrated profile, spin frequency, flux density, and spectral index ($\\alpha$, defined by $S \\propto f^{\\alpha}$). The first time derivative of its spin frequency $\\dot{\\nu}$ passed through four distinct phases -- rapid decrease, violent oscillation, steady decline, and stable recovery -- before returning to its pre-outburst value concomitant with the cessation of radio emission. Remarkably, both the amplitudes and the characteristic time-scales of these $\\dot{\\nu}$ variations match those observed during the previous outburst that began in 2003, providing the first demonstration that post-outburst rotational evolution and radiative behavior in a magnetar are repeatable. A twisted-magnetosphere model can qualitatively account for this repeatability as well as for the progressive narrowing and abrupt disappearance of the radio pulse radiation, thereby receiving strong observational support.",
"arxiv_id": "2601.07173",
"authors": [
"Zhipeng Huang",
"Zhen Yan",
"Zhiqiang Shen",
"Hao Tong",
"Mingyu Ge",
"Zhifu Gao",
"Yajun Wu",
"Rongbing Zhao",
"Jie Liu",
"Rui Wang",
"Xiaowei Wang",
"Fan Yang",
"Chuyuan Zhang",
"Zhenlong Liao",
"Yangyang Lin"
],
"categories": [
"astro-ph.HE"
],
"license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
"title": "Does the radio-active phase of XTE~J1810$-$197 recur following the same evolutionary pattern?",
"url": "https://arxiv.org/abs/2601.07173",
"version": "v1"
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