Sgr A* exhibits a white-noise-like flat variability regime in its 340 GHz flux on timescales below 2.3 to 6.3 minutes, transitioning to red-noise-like behavior at longer timescales, with no evidence for narrow periodic signals.
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Sgr A* 340 GHz variability in one ALMA epoch is consistent with multiple decaying orbiting hotspots near the innermost stable circular orbit.
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Short timescale variation in the submillimeter flux of Sagittarius A*
Sgr A* exhibits a white-noise-like flat variability regime in its 340 GHz flux on timescales below 2.3 to 6.3 minutes, transitioning to red-noise-like behavior at longer timescales, with no evidence for narrow periodic signals.
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Evidence for Multiple Orbiting Hotspots in the 340 GHz Variability of Sgr A*
Sgr A* 340 GHz variability in one ALMA epoch is consistent with multiple decaying orbiting hotspots near the innermost stable circular orbit.