arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2404.02496astro-ph.HEgr-qc
收藏

关于 GW190425 与其潜在电磁对应体 FRB 20190425A 的关联性

On the association of GW190425 with its potential electromagnetic counterpart FRB 20190425A

Ignacio Magaña Hernandez, Virginia D'Emilio, Soichiro Morisaki, Mohit Bhardwaj, Antonella Palmese

AI总结:

本研究通过时空定位重叠和贝叶斯参数估计检验了双中子星并合事件 GW190425 与快速射电暴 FRB 20190425A 的多信使关联,发现观测角强烈倾向偏轴系统且双星总质量增加黑洞直接坍缩概率,从而不支持两者关联及长寿命超大质量中子星形成假说。

摘要:

Moroianu 等人 (2022) 最近的最新研究提出,双中子星 (BNS) 并合事件 GW190425 可能存在潜在的快速射电暴 (FRB) 对应体关联,即 FRB 20190425A,其置信水平为 2.8$\sigma$,并且可能存在宿主星系关联,即 UGC10667。作者认为,这些观测结果与 BNS 并合后迅速形成并稳定存在约 2.5 小时,随后直接坍缩成黑洞的长寿命超大质量中子星 (HMNS) 的假设相符。近期,Bhardwaj 等人 (2023) 最终确认了 FRB 20190425A 与 UGC10667 的关联,这为 GW190425 提供了一个直接的宿主星系候选体。在本研究中,我们基于 GW190425 与 FRB 宿主星系 UGC10667 之间的时空定位重叠情况,检验了这种多信使关联,发现偶然关联的几率仅为 $\mathcal{O}(5)$。我们使用高斯过程 (GP) 密度估计器验证了该估算结果。假设该关联确实存在,我们随后在 BNS 事件发生于 UGC10667 的假设下,对 GW190425 进行了贝叶斯参数估计。我们发现,GW190425 的观测角排除了正向系统,其 $p(\theta_v>30^o)\approx99.99$\\%,强烈倾向于类似 GRB 170817A 的偏轴系统。我们还发现该双星系统的源坐标系总质量略高,即 $m_{\rm{total}} = 3.42^{+0.34}_{-0.11} M_{\odot}$,这增加了直接坍缩成黑洞的概率,因此不利于长寿命 HMNS 的形成假说。基于我们的研究结果,我们得出结论:当前最先进的引力波分析并不支持 GW190425 与 FRB 20190425A 之间的关联性。

英文摘要:

Recent work by Moroianu et al. (2022) has suggested that the binary neutron star (BNS) merger GW190425 might have a potential fast radio burst (FRB) counterpart association, FRB 20190425A, at the 2.8$σ$ level of confidence with a likely host galaxy association, namely UGC10667. The authors argue that the observations are consistent with a long-lived hypermassive neutron star (HMNS) that formed promptly after the BNS merger and was stable for approximately 2.5 hours before promptly collapsing into a black hole. Recently, Bhardwaj et al. (2023) conclusively associated FRB 20190425A with UGC10667, potentially providing a direct host galaxy candidate for GW190425. In this work, we examine the multi-messenger association based on the space-time localization overlaps between GW190425 and the FRB host galaxy UGC10667 and find that the odds for a coincident association are $\mathcal{O}(5)$. We validate this estimate by using a Gaussian Process (GP) density estimator. Assuming that the association is indeed real, we then perform Bayesian parameter estimation on GW190425 assuming that the BNS event took place in UGC10667. We find that the viewing angle of GW190425 excludes an on-axis system at $p(θ_v>30^o)\approx99.99$\%, highly favouring an off-axis system similar to GRB 170817A. We also find a slightly higher source frame total mass for the binary, namely, $m_{\rm{total}} = 3.42^{+0.34}_{-0.11} M_{\odot}$, leading to an increase on the probability of prompt collapse into a black hole and therefore disfavors the long-lived HMNS formation scenario. Given our findings, we conclude that the association between GW190425 and FRB 20190425A is disfavoured by current state-of-the-art gravitational-wave analyses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑