Confirmation of Sgr A* Using the Event Horizon Telescope Data as Extreme Binary of the Supermassive Black Holes Concluded by Decameter Radio Wave Pulse Observations

概要

Studies on the time variation of radio wave fluxes from Sgr A*
have expanded, starting from investigations of the intermittently occurring flares detected by millimeter-range radio wave
telescopes [1-4]. In time variation studies in millimeter range
wavelength radio wave fluxes, short time variations with periods
ranging around half hour have gradually emerged in the Sgr A*
emissions not only in times of flare as well as in the quiescent
structure [5,6], suggesting some periodicity [7].
Alongside the studies of time variations of SgrA* by observations of radio telescope including the very long baseline interferometry (VLBI), decameter wavelength radio wave pulse
(DRWP) observations of Sgr A* have been continued since
2000. These observations seek to identify the spin signatures of
the event horizons of possible supermassive black holes [8]. ...

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