标题： 蟹状星云在射电和光学波段的新膨胀率测量 显示英文标题

标题： New expansion rate measurements of the Crab Nebula in radio and optical

摘要： 我们提供了蟹状星云同步辐射星云在约30年期间膨胀速率的新射电测量结果。 我们发现射电同步辐射星云的收敛日期为公元1255年±27年。 我们还重新评估了光学线发射丝状物的膨胀速率，并表明它们的传统收敛日期估计存在轻微偏差。 使用无偏见的贝叶斯分析，我们发现丝状物的收敛日期为公元1091年±34年（比以前的估计早约40年）。 我们的结果表明，自公元1054年的爆炸以来，同步辐射星云和光学线发射丝状物都已被加速，但同步辐射星云相对而言被强烈加速，而光学丝状物仅被轻微加速。 同步辐射辐射膨胀得比丝状物更快这一发现支持了这样的观点，即后者是脉冲星风星云与周围自由膨胀的超新星抛射物之间界面处的瑞利-泰勒不稳定性结果，并排除了脉冲星风泡直接与蟹状星云前身星的超新星前风相互作用的模型。 显示英文摘要

摘要： We present new radio measurements of the expansion rate of the Crab nebula's synchrotron nebula over a ~30-yr period. We find a convergence date for the radio synchrotron nebula of CE 1255 +- 27. We also re-evaluated the expansion rate of the optical line emitting filaments, and we show that the traditional estimates of their convergence dates are slightly biased. Using an un-biased Bayesian analysis, we find a convergence date for the filaments of CE 1091 +- 34 (~40 yr earlier than previous estimates). Our results show that both the synchrotron nebula and the optical line-emitting filaments have been accelerated since the explosion in CE 1054, but that the synchrotron nebula has been relatively strongly accelerated, while the optical filaments have been only slightly accelerated. The finding that the synchrotron emission expands more rapidly than the filaments supports the picture that the latter are the result of the Rayleigh-Taylor instability at the interface between the pulsar-wind nebula and the surrounding freely-expanding supernova ejecta, and rules out models where the pulsar wind bubble is interacting directly with the pre-supernova wind of the Crab's progenitor.