Fig. 1: Light curves of flux and linear polarization in the whole observation.
From: Quasi-periodic oscillations of GHz-band polarization in a black hole
Top panel: The light curve of total intensity flux density observed by FAST in the 1.05–1.45 GHz band from 2021-01-25:01:45:00 to 2021-01-25:03:04:57 (UT). The flux density began to increase from the time  ~1500 s and reached a peak around 3200 s. Middle panel: the light curve of the linear polarization (LP) degree. Bottom panel: The dynamical power spectrum of the LP curve for the observed time ___domain. During the increasing phase of the radio flare, there exist transient quasi-periodic signals at  ~17 and 33 s for LP during the interval 2700–3100 s. The orange contour in the bottom panel represents the line of 95% confidence levels. Source data are provided as a Source Data file.
