卫星黑洞穿越磁化星系核吸积盘产生的准周期性爆发

本文提出了一种双通道模型，解释了星系核中准周期性爆发（QPEs）的起源。该模型通过卫星黑洞穿越吸积盘时的引力聚焦与磁重联过程，成功模拟了观测到的X射线耀斑及其延迟的紫外对应体。

arXiv:2608.19796v1 Announce Type: new Abstract: Quasi-periodic eruptions (QPEs) are recurrent soft X-ray flares from galactic nuclei, but their origin remains uncertain. The delayed ultraviolet (UV) counterpart detected in Ansky provides a new constraint on viable models. We present a two-channel model in which a satellite black hole (sBH) repeatedly crosses a nuclear accretion disk threaded by a large-scale magnetic field. Gravitational focusing and dynamical drag generate hot, optically thick ejecta whose expansion and photon diffusion power the soft X-ray QPE. For fiducial Bondi-scale parameters, the model yields a characteristic X-ray duration of $\sim10^3\ \mathrm{s}$ and luminosity of $\sim10^{42}\ \mathrm{erg\,s^{-1}}$; at lower orbital inclinations, the duration extends to the day-long scale observed in Ansky. Simultaneously, the sBH motion compresses and bends the background magnetic field, triggering in-disk reconnection. The dissipated energy then emerges after photon diffusion as a broader, delayed UV response. The resulting thermal power is comparable to the variable UV luminosity of Ansky. Unfavorable magnetic fields or diffusion times longer than the QPE recurrence period can weaken or smear out the UV signal, potentially explaining the lack of clear UV counterparts in other QPE sources.