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Simultaneous JWST, NuSTAR, and VLA Monitoring of Sgr A*: A Unified Picture of the Variable IR, X-Ray, and Radio Emission

  • Authors: F. Yusef-Zadeh, M. Wardle, R. G. Arendt, C. O. Heinke, C. J. Chandler, H. Bushouse, G. A. Moellenbrock, Joseph M. Michail

F. Yusef-Zadeh et al 2026 The Astrophysical Journal Letters 1000 .

  • Provider: AAS Journals

Caption: Figure 14.

A schematic diagram of how X-ray flare emission from Sgr A* is generated by ICS of NIR photons. This picture is very similar to the production of solar flare emission and coronal mass ejections from the Sun (B. Chen et al. 2020; J. F. Drake et al. 2025; also see X. Lin & F. Yuan 2024). Reconnection occurs in a current sheet extending from a flux rope ejected toward the observer back to the accretion flow of Sgr A* (orange) (B. Chen et al. 2020). Heated plasma flows into the reconnection point (pink arrows), followed by ejection parallel to the current sheet (red arrows). The energetic electrons directed toward the accretion flow produce NIR synchrotron emission, whereas those away from the disk emit appreciable synchrotron emission at submillimeter (blue shading) and radio frequencies (dark orange) (see text).

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