Kavli Affiliate: Li Xin Li
| First 5 Authors: Zhen Cao, F. Aharonian, Q. An, Axikegu, Y. X. Bai
| Summary:
We report the detection of an extended very-high-energy (VHE) gamma-ray
source coincident with the location of middle-aged (62.4~rm kyr) pulsar PSR
J0248+6021, by using the LHAASO-WCDA data of live 796 days and LHAASO-KM2A data
of live 1216 days. A significant excess of gray induced showers is observed
both by WCDA in energy bands of 1-25~rm TeV and KM2A in energy bands of $>$
25~rm TeV with 7.3 $sigma$ and 13.5 $sigma$, respectively. The best-fit
position derived through WCDA data is R.A. = 42.06$^circ pm$ 0.12$^circ$ and
Dec. = 60.24$^circ pm $ 0.13$^circ$ with an extension of
0.69$^circpm$0.15$^circ$ and that of the KM2A data is R.A.= 42.29$^circ pm
$ 0.13$^circ$ and Dec. = 60.38$^circ pm$ 0.07$^circ$ with an extension of
0.37$^circpm$0.07$^circ$. No clear extended multiwavelength counterpart of
this LHAASO source has been found from the radio band to the GeV band. The most
plausible explanation of the VHE gray emission is the inverse Compton process
of highly relativistic electrons and positrons injected by the pulsar. These
electrons/positrons are hypothesized to be either confined within the pulsar
wind nebula or to have already escaped into the interstellar medium, forming a
pulsar halo.
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