Fig. 1.
Light curves of PG 1447+273. Top panel: light curve of PG 1447+273 in the X-ray band (0.2–10 keV). Middle panel: X-ray hardness ratio over time. Bottom panel: light curves of PG 1447 + 273 in the optical/ultraviolet band. The time and ID of the observation are denoted in the top panel. The red lines in the top panel represent the average X-ray fluxes during the corresponding observation period. According to the respective average X-ray fluxes, as shown in the figure, the single observation is further divided into high and low states.
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