Preprint Article Version 1 This version is not peer-reviewed

Interpretation of Time-Varying Radio Emissions of SgrA* Observed by 1.3 Millimeter-Wavelength VLBI ---with Parameters of The Super-Massive Black Hole Binary at SgrA* Based on Decameter Radio Wave Pulse Observations

Version 1 : Received: 13 May 2022 / Approved: 13 May 2022 / Online: 13 May 2022 (11:01:08 CEST)

How to cite: Oya, H. Interpretation of Time-Varying Radio Emissions of SgrA* Observed by 1.3 Millimeter-Wavelength VLBI ---with Parameters of The Super-Massive Black Hole Binary at SgrA* Based on Decameter Radio Wave Pulse Observations. Preprints 2022, 2022050192 (doi: 10.20944/preprints202205.0192.v1). Oya, H. Interpretation of Time-Varying Radio Emissions of SgrA* Observed by 1.3 Millimeter-Wavelength VLBI ---with Parameters of The Super-Massive Black Hole Binary at SgrA* Based on Decameter Radio Wave Pulse Observations. Preprints 2022, 2022050192 (doi: 10.20944/preprints202205.0192.v1).

Abstract

In 2011, by 1.3 mm wavelength VLBI radio wave observations of the SgrA*, Fish, V. L. et al showed that the emissions tightly related to the formation of a black hole shadow have a remarkably large time-varying feature within a region of less than 50 μas. The present paper suggests that the origin of the time variation in the observed emission is due to effects of the orbital motion of the existing super-massive black hole binary orbiting at SgrA* with a period of 2150±2.5 s. This suggestion is based on observations of decameter radio wave pulses from SgrA*. We show a good correlation between the time variation in the coherent flux density of the VLBI results and the time variation model of estimated emission intensities based on the periodic motion of the super-massive black hole binary by applying parameters deduced from the decameter radio wave pulse observation model (DRWP-Model). With further confirmation by Fourier analyses of the potential periodicity of the VLBI data that show the same periods of DRWP Model, we conclude that the time variation detected by the 1.3 mm wavelength radio wave VLBI is evidence of an existing super-massive black hole at Sgr A*.

Keywords

galaxy center; supermassive black hole; black hole binary; VLBI; submillimeter radio wave; decameter radio wave; event horizon

Subject

PHYSICAL SCIENCES, Astronomy & Astrophysics

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