Sgr A* MeerKAT 2.79GHz light curve

However, variability at radio frequencies below ~5GHz for timescales shorter than a day remains largely unexplored. We investigate the variability of Sgr A* at 2.79GHz on short timescales (1-min), to probe an under-explored regime of its emission process.

Through point-source model fitting in the uv-domain, we analyse the flux density variation of Sgr A* over an 8h observation. We detect flux variation on a few tens of minute timescale with a modulation index of 6.11%, a mean flux density of 827+/-0.1(stat)+/-33(sys)mJy, and a mean spectral slope of 0.08+/-0.03. Furthermore, we measure the slope of the structure function of the observed light curve as 0.81+/-0.05 with a characteristic timescale of about 120-min.