Speaker
Description
Radio emission from magnetars is closely linked to their X-ray activity, yet the connection remains complex. Radio emission is typically observed during and after X-ray outbursts, exhibiting highly variable flux evolution, in contrast to the more monotonic decay seen in X-rays. In this paper, we present a phase-resolved X-ray spectroscopic analysis of the 2018 outburst of XTE J1810−197. Pulse phases are defined using both X-ray and radio pulse profiles to enable a direct comparison between the two emission regimes. We model the phase-resolved spectra using blackbody, power-law, or their combination. In addition, we investigate the evolution of the components in the X-ray pulse profile. These results are then compared with the radio evolution reported in the literature. We find that most spectra require two-component models to achieve acceptable fits, while some phases at certain epochs can be well described by a single-component model. However, neither the spectral parameters nor the epochs where single-component models are sufficient show a clear evolutionary correlation with the radio behavior, despite the complex variability seen in the radio emission. This study provides new insights into the phase-dependent coupling between X-ray and radio emission processes in magnetars and helps constrain the multiwavelength behavior.
| Participate the oral/poster presentation award competition | No |
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