Speaker
Description
Electrons and positrons escaping from pulasar wind nebulae (PENe) generated an extended gamma-ray structures and considered as a new class of gamma-ray sources - pulsar halo. We report the detection of an extended very-high-energy (VHE) gamma-ray source coincident with the locations of middle-aged (62.4 kyr) PSR J0248+6021, by using the LHAASO-WCDA data of live 784 days and LHAASO-KM2A data of live 1216 days. A significant excess of gamma ray-induced shower is observed both by WCDA in energy bands of 2-30 TeV and KM2A in energy bands of $>$ 25 TeV with 6.3 $\sigma$ and 11.6$\sigma$. The best-fit position given by WCDA is R.A. = 42.14 $\pm$ 0.17$^\circ$ and DEC. = 60.25$\pm$0.12$^\circ$ and by KM2A is R.A.= 42.29$\pm$0.13$^\circ$ and DEC. = 60.38$\pm$0.07$^\circ$ . No clear extended multiwavelength counterpart of the LHAASO source has been found from radio band to GeV band. If the LHAASO obervations are consistent with the pulsar halo scenario, the diffusion coefficient of this source is consistent with LHAASO J0622+ 3749.
