AI 中文总结
本研究首次系统探究双毫秒脉冲星PSR J2144−5237的千兆赫峰谱转折频率轨道演化，发现其受伴星磁化等离子体的回旋共振吸收调控，该演化可作为双星内介质的新诊断工具，为脉冲星风-伴星相互作用提供新探测手段。
AI 中文摘要
我们首次对双毫秒脉冲星PSR J2144−5237的千兆赫峰谱转折频率（ν_peak）的连续轨道演化开展系统研究。利用帕克斯望远镜超宽带低频接收机，我们获取了约50小时的密集采样观测数据，覆盖了约10天的轨道周期，频率范围为704 MHz至4 GHz，实现了对双星轨道全程光谱演化的可靠测量。我们检测到第一脉冲和第二脉冲分量的转折频率随轨道相位存在清晰且系统的调制，尽管这两个发射分量源自脉冲星磁层内不同的发射区域，但表现出极为相似的演化趋势。两个脉冲分量的相关演化强烈表明，观测到的光谱变化由双星内环境中的传播过程所控制。转折频率的大幅轨道调制可由伴星相关磁化等离子体中的回旋共振吸收来解释，而其他吸收机制无法重现观测到的行为。在回旋吸收框架内对转折频率的轨道演化进行建模，可约束脉冲星风的电子密度分布，估算伴星的磁场强度，并对吸收等离子体和双星系统的几何结构施加限制。本研究确立了千兆赫峰谱的轨道演化作为磁化双星内介质的一种强大新诊断工具，并为食双星毫秒脉冲星双星中脉冲星风-伴星相互作用提供了一种迄今未被探索的探测手段。
英文摘要
We present the first systematic investigation of the continuous orbital evolution of the Gigahertz-Peaked Spectum turnover frequency ($ν_{peak}$) in the binary millisecond pulsar, PSR J2144$-$5237. Using approximately 50 hours of densely sampled observations spanning the $\sim10$-day orbit with the Parkes Ultra-Wideband Low frequency receiver, we obtained continuous frequency coverage from 704 MHz to 4 GHz, enabling robust measurements of the spectral evolution throughout the binary orbit. We detect a clear and systematic modulation of the turnover frequency with orbital phase for both the $1^{st}$ pulse and $2^{nd}$ pulse components, with both emission components exhibiting remarkably similar evolutionary trends despite originating from distinct emission regions within the pulsar magnetosphere. The correlated evolution of the two pulse components strongly suggests that the observed spectral variability is governed by propagation through the intra-binary environment. The large orbital modulation of turnover frequency can be explained by cyclotron resonance absorption in magnetized plasma associated with the companion, while alternative absorption mechanisms are unable to reproduce the observed behaviour. Modelling the orbital evolution of the turnover frequency within the cyclotron absorption framework, can constrain the electron density distribution in the pulsar wind, estimate the magnetic field strength of the companion, and place limits on the geometry of the absorbing plasma and the binary system. This study establish orbital evolution of the Gigahertz Peaked Spectum as a powerful new diagnostic of the magnetized intra-binary medium and provide a hitherto unexplored probe of pulsar wind-companion interactions in eclipsing millisecond pulsar binaries.
CommentsAccepted in The Astrophysical Journal (ApJ)
