Speaker
Description
We report the detection of a TeV gamma-ray source, designated as LHAASO J1915+1149. The detection significance is 11𝜎 in the WCDA band and 18.5𝜎 in the KM2A band. The source is spatially coincident with the pulsar PSR J1915+1150. Its morphology in the WCDA band is consistent with a diffusion model, whereas no significant extension is resolved in the KM2A band, aligning with a point-like source model. The TeV emission spectrum is well described by a leptonic model. Consequently, the source is consistent with the pulsar halo scenario. However, given its large distance (d = 14 kpc), the diffusion coefficient derived from the source size in the WCDA band is 4e28 𝑐𝑚^2/𝑠, which is significantly higher than that of typical pulsar halos. This discrepancy might arise from the anisotropic diffusion of particles, resulting in an elongated emission region with major and minor axes. Because this asymmetry is unresolved by the instrument's point spread function (PSF), it leads to an artificially large inferred diffusion coefficient.
