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arXiv 2301.06403astro-ph.HE
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快速蓝光瞬变体射电辐射的种群研究

A Population Study on the Radio Emission of Fast Blue Optical Transients

Jian-Feng Liu, Liang-Duan Liu, Yun-Wei Yu, Jin-Ping Zhu

AI总结:

本研究基于磁星驱动模型和FBOTs种群参数分布,探讨了前身星质量损失率对射电辐射的影响,并评估了现有及未来望远镜对射电辐射的可探测性,发现中国空间站望远镜与SKA联合观测可将探测成功率提升至约23.9%。

摘要:

尽管快速蓝光瞬变体(FBOTs)的前身星仍存在争议,但有时认为 FBOTs 起源于超剥离恒星的核心坍缩,并由自旋减慢的中子星提供能量。基于此考虑,由于恒星的强烈质量损失,预期前身星的晚期演化会在 FBOTs 的星周物质(CSM)中留下重要印记。FBOTs 抛射物与 CSM 的相互作用可以驱动持久激波从而产生射电辐射,这使我们能够通过射电观测来探测 CSM 性质,尽管此类观测仍然很少。在磁星驱动模型框架内,Liu et al.(2022) 拟合了 40 个 FBOTs 的多波段光变曲线,从而获得了 FBOTs 磁星和抛射物参数的统计分布。基于这些 FBOTs 种群结果,我们研究了射电辐射对前身星质量损失率的依赖性,并评估了当前和未来望远镜对 FBOTs 射电辐射的可探测性。结果发现,8.4 GHz 处辐射的峰值时间和峰值光度的分布主要分别在 $t_{\rm{peak},ν}=10^{2.12\pm0.63}$ 天和 $L_{\rm{peak},ν}=10^{28.73\pm0.83}$ erg s$^{-1}$ Hz$^{-1}$ 区域。Zwicky Transient Facility 和 Very Large Array 的联合探测可以在约 8.7% 的 $z\leq1$ 的 FBOTs 中取得成功。此外,如果考虑中国空间站望远镜和 Square Kilometer Array 的联合观测,该比例可提高到约 23.9%。

英文摘要:

Despite the fact that the progenitor of fast blue optical transients (FBOTs) is still up for debate, FBOTs are sometimes suggested to originate from the core-collapse of ultra-stripped stars and be powered by a spinning-down neutron star. Following this consideration, it is expected that the late-time evolution of the progenitor stars can leave important imprints in the circumstellar material (CSM) of the FBOTs, due to the strong mass loss of the stars. The interaction of the FBOT ejecta with the CSM can drive a long-lasting shock to generate radio emission, which thus enables us to probe the CSM properties through radio observation although such observations are still rare. Within the framework of the magnetar-powered model, Liu et al.(2022) fitted the multi-band optical light curves of 40 FBOTs and, hence, the statistical distributions of the FBOT magnetar and ejecta parameters were obtained. Based on these FBOT population results, we investigate the dependence of the radio emission on the mass-loss rate of the progenitors and evaluate the detectability of radio emission from FBOTs with current and future telescopes. It is found that the distribution of the peak time and peak luminosity of the emission at 8.4 GHz are primarily in the regions of $t_{\rm{peak},ν}=10^{2.12\pm0.63}$ days and $L_{\rm{peak},ν}=10^{28.73\pm0.83}$ erg s$^{-1}$ Hz$^{-1}$, respectively. A joint detection of the Zwicky Transient Facility and Very Large Array could achieve success in about 8.7% FBOTs of $z\leq1$. Furthermore, if considering a joint observation of the Chinese Space Station Telescope and Square Kilometer Array, this fraction can be increased to about 23.9%.

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。

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