Speaker
Description
The microquasar MAXI J1820+070 was discovered during its X-ray outburst in 2018. Previous KM2A observations identified a point-like gamma-ray excess with a significance of about 6 sigma near the source, though the position was located 0.27 degrees northeast of the black hole. Based on approximately four and a half years of observations, WCDA also detected an excess with a significance of 4.3 sigma (0.6–20 TeV) near J1820. Interestingly, preliminary analysis suggests that the flux measured by KM2A is higher than the extrapolation of the WCDA spectrum, and there is a positional discrepancy of about 0.2 degrees between the WCDA and KM2A sources. These features may suggest a complex physical environment and a multi-component origin of gamma-ray emission across a broad energy range. We anticipate that AI-enhanced analyses will improve the detection significance in the WCDA energy range and help clarify this scenario.
