Tracing Hot Spot Motion in Sagittarius A* Using the Next-Generation Event Horizon Telescope (ngEHT)

We propose the tracing of motion a shearing hot spot near Sgr A* source through dynamical image reconstruction algorithm, StarWarps. Such may form as exhaust magnetic reconnection in current sheet black hole horizon. A that is ejected from into an orbit accretion disk shear and diffuse due to instabilities at its boundary during orbit, resulting distinct signature. subdivide two different phases: first phase refers appearance modeled bright blob, followed by subsequent phase. employ observational array configurations, including EHT (2017, 2022) next-generation Event Horizon Telescope (ngEHTp1, ngEHT) arrays, with several new sites added, make reconstructions for each them. Subsequently, we infer angular location phase, axes ratio ellipse area second focus on direct observability orbiting sub-mm wavelength. Our analysis demonstrates this particular simulation, newly added dishes are better able trace well part before flux reduced substantially, compared arrays. The algorithm used work can be easily extended other types dynamics, timescales. More simulations required prove whether set proposed sufficient resolve any motions variable sources, such A*.