Speaker
Description
We report the analysis results in the 2-degree range around G57.2+0.8 by LHAASO using the WCDA data and KM2A data up to July 2024. Compared with other templates, a template with one dust and three additional sources can explain the high-energy gamma-ray emission well in this region. During the processing, the location of the TeV source (TeV J1943+213) was fixed, and the other two fitted sources may correspond to a millisecond pulsar (B1937+21) with extension around 0.55 degree, a pulsar (B1930+22) as a point source, respectively, while the former has a higher energy than the latter. The spectral energy distribution corresponding to the dust template is similar to that of the diffuse gamma-ray emision (DGE) measured by LHAASO, but the flux is about 2.0 times higher. Below 100 TeV, this flux in this region is higher than that of the gamma-ray spectrum produced by the interaction of the measured proton spectrum with the local gas, indicating the presence of local high-energy cosmic rays. Its origin may be related to G57.2+0.8.
