标题： 约束短伽马射线暴中晚时无线电观测的长寿命磁星遗迹 显示英文标题

标题： Constraining the long-lived magnetar remnants in short gamma-ray bursts from late-time radio observations

摘要： GW170817与GRB170817A的联合探测表明，至少有一部分短伽马射线暴（SGRBs）起源于双中子星（BNS）合并。BNS合并的一个可能遗迹是快速旋转且强磁化的中子星，这被讨论为一种可能的伽马射线暴（GRBs）中心引擎。对于快速旋转的磁星作为中心引擎的情况，旋转能量沉积到由合并抛射出的物质中可能会导致明亮的无线电发射。数年后SGRB的无线电发射亮度可以提供抛射物质动能的估计，从而对BNS合并产物施加可能的限制。我们在磁星情景下，对合并抛射物与周边介质相互作用产生的无线电发射亮度进行了更详细的计算，涉及了几个重要的物理过程，如通用流体力学、相对论效应以及深入牛顿阶段。我们使用该模型来约束具有晚期无线电观测的15个SGRBs的允许参数空间。我们的结果显示，所有情况下允许的能量注入量为$E_{\rm inj} \sim 10^{52}$ 尔格，这表明超大质量或超大质量中子星遗迹的可能性并未因现有的无线电数据而被排除。 显示英文摘要

摘要： The joint detection of GW 170817 and GRB 170817A indicated that at least a fraction of short gamma ray bursts (SGRBs) originate from binary neutron star (BNS) mergers. One possible remnant of a BNS merger is a rapidly rotating, strongly magnetized neutron star, which has been discussed as one possible central engine for GRBs. For a rapidly rotating magnetar central engine, the deposition of the rotation energy into the ejecta launched from the merger could lead to bright radio emission. The brightness of radio emission years after an SGRB would provide an estimation of the kinetic energy of ejecta and hence, a possible constraint on the BNS merger product. We perform a more detailed calculation on the brightness of radio emission from the interaction between the merger ejecta and circumburst medium in the magnetar scenario, invoking several important physical processes such as generic hydrodynamics, relativistic effects, and the deep Newtonian phase. We use the model to constrain the allowed parameter space for 15 SGRBs that have late radio observations. Our results show that an injected energy $E_{\rm inj} \sim 10^{52}$ erg is allowed for all the cases, which suggests that the possibility of a supra-massive or hyper-massive neutron star remnant is not disfavored by the available radio data.