A Face-on Accretion Disk Geometry Revealed by Millimeter-wave Periodicity in Sgr A${}^{\ast }$

Kazuki Yanagisawa, Tomoharu Oka, Ryo Ariyama +3

We analyzed 77 epochs of Atacama Large Millimeter/submillimeter Array (ALMA) archival data to investigate flux variability in Sagittarius A${}^{\ast }$ (Sgr A${}^{\ast }$), the supermassive black…