Modelling the Periodic 6.7 GHz Methanol Flaring in G22.356+0.066

ABSTRACT We present a comprehensive analysis of the periodic flares observed in the 6.7 GHz methanol transition in G22.356+0.066, utilizing the Maxwell–Bloch equations (MBEs) as a framework to model these phenomena. By solving the one-dimensional MBEs, we describe the behaviour of both the quasi-steady-state maser and transient superradiance regimes. Our findings indicate that the observed periodic flares, with varying time-scales across different velocities, are consistent with the characteristics of Dicke’s superradiance, triggered by a common radiative pump in regions of varying inverted column densities. This work provides new insights into the physical processes governing variability in maser-hosting regions and underscores the significance of superradiance as a powerful radiation mechanism in astrophysical environments.