Conditions under which NIR flares from Sgr A* have X-ray counterparts

Determine the physical conditions and mechanisms that cause some near-infrared (NIR) flares from Sgr A* to have detectable X-ray counterparts while others do not, and characterize the criteria distinguishing NIR flares that produce X-ray emission from those that do not.

Background

The paper reviews multiwavelength variability of Sgr A*, noting that X-ray flares consistently show NIR counterparts, indicating a close physical connection between the bands. However, not all NIR flares are accompanied by X-ray flares, and the reasons for this discrepancy remain unresolved in the literature.

Clarifying the conditions that lead to the presence or absence of X-ray counterparts for NIR flares is essential for constraining emission mechanisms (e.g., synchrotron, inverse Compton, or synchrotron self-Compton) and the geometry or physical state of the inner accretion flow and any transient acceleration events.