Searching for the radio remnants of short-duration gamma-ray bursts
Searching for the radio remnants of short-duration gamma-ray bursts
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DOI：
10.1093/mnras/staa3241
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发表时间：
2020-08
影响因子：
4.8
通讯作者：
R. Ricci;E. Troja;G. Bruni;T. Matsumoto;L. Piro;Brendan O'Connor;T. Piran;Niloofar Navaieelavasani;A. Corsi;B. Giacomazzo;M. Wieringa
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作者：
R. Ricci;E. Troja;G. Bruni;T. Matsumoto;L. Piro;Brendan O'Connor;T. Piran;Niloofar Navaieelavasani;A. Corsi;B. Giacomazzo;M. Wieringa
中子星星合并产生大量快速移动的喷出物，并在合并后的数年内向外扩张。这些喷出物与周围介质的相互作用可能会产生一个弱的各向同性的无线电残余，在相对较近的事件中可以检测到。我们使用的短持续时间伽玛射线暴（sGRBs）的晚期射电观测来约束这个模型。研究了两个事件样本：选择了可能在局部（<200 Mpc）宇宙中的四个sGRB来限制亚相对论性喷出物的残余非热发射，而宇宙学距离上的17个sGRB用于限制原磁星中央引擎的存在，可能重新激活合并喷出物。我们考虑了GRB~ 170817 A/GW ~ 170817的情况，发现在这种情况下，早期的射电辐射可能被喷流冲击波猝灭。在所有情况下，对于M_ej \lesssim 10^{-2}（5 * 10^{-2}）M_sun的喷射物质量范围，我们可以排除能量非常高的合并喷射物E_ej \gtrsim 5 * 10^{52}（10^{53}）erg，从而排除了作为合并残余物的强大磁星的存在。
Neutron star mergers produce a substantial amount of fast-moving ejecta, expanding outwardly for years after the merger. The interaction of these ejecta with the surrounding medium may produce a weak isotropic radio remnant, detectable in relatively nearby events. We use late-time radio observations of short duration gamma-ray bursts (sGRBs) to constrain this model. Two samples of events were studied: four sGRBs that are possibly in the local (<200 Mpc) universe were selected to constrain the remnant non-thermal emission from the sub-relativistic ejecta, whereas 17 sGRBs at cosmological distances were used to constrain the presence of a proto-magnetar central engine, possibly re-energezing the merger ejecta. We consider the case of GRB~170817A/GW170817, and find that in this case the early radio emission may be quenched by the jet blast-wave. In all cases, for ejecta mass range of M_ej \lesssim 10^{-2} (5 * 10^{-2}) M_sun, we can rule out very energetic merger ejecta E_ej \gtrsim 5 * 10^{52}(10^{53}) erg, thus excluding the presence of a powerful magnetar as a merger remnant.