AI 中文总结
本研究在磁阻吸积盘框架下，采用喷流-喷流茧模型，发现盘磁场可抑制喷流茧横向膨胀、增强低功率喷流准直性，还能促进双黑洞并合产生的低功率喷流的 breakout。
AI 中文摘要
活动星系核（AGN）的盘内普遍存在大量大质量恒星与致密天体。由大质量恒星坍缩及致密天体并合触发的恒星尺度喷流，可在盘中传播并产生可观测的电磁辐射。磁阻吸积盘（MAD）已得到数值模拟与观测的支持，其拥有强磁场（MFs）。当喷流在这类环境中传播时，磁场会调控喷流演化并塑造辐射特征。本研究在MAD框架下探究盘磁场对喷流传播及 breakout 辐射的影响，采用了考虑盘磁场潜在效应的喷流-喷流茧模型，涵盖磁压与磁重联驱动的磁能耗散。研究发现，磁压可有效抑制喷流茧的横向膨胀，从而增强喷流准直性并适度提升喷流头速度；且磁压效应在喷流功率相对较低时更为显著，在此 regime 下，喷流头激波的 breakout 光度会增强，breakout 时间缩短，但光度增强幅度对采用的 regime 相关辐射处方敏感。这些结果表明，在探究的参数空间内，盘磁场可促进 AGN MAD 中双黑洞并合产生的低功率喷流的 breakout。
英文摘要
It is widely recognized that active galactic nucleus (AGN) disks host numerous massive stars and compact objects. Stellar-scale jets triggered by collapses of massive stars and mergers of compact objects could propagate through the disk and produce observable electromagnetic radiation. Magnetically arrested disks (MADs), supported by both numerical simulations and observations, possess strong magnetic fields (MFs). As jets travel within such environments, the MFs should regulate jet evolution and shape radiation signatures. In this work, we explore the effects of disk MFs on jet propagation and breakout emission within the MAD framework. We employ a jet-cocoon model that accounts for potential disk-MF effects, including both magnetic pressure and magnetic energy dissipation driven by magnetic reconnection. We find that magnetic pressure effectively suppresses the lateral expansion of the cocoon, which enhances jet collimation and modestly increases the jet-head velocity. Furthermore, magnetic pressure effects are more pronounced at relatively low jet powers. In this regime, the breakout luminosity of the jet-head shock is enhanced, while its breakout time is shortened. However, the magnitude of the luminosity enhancement is sensitive to the adopted regime-dependent emission prescriptions. These findings suggest that, within the explored parameter space, disk MFs can facilitate the breakout of low-power jets arising from binary black hole mergers in AGN MADs.
Comments14 pages, 10 figures, accepted for publication in ApJ
