Speaker
Description
We report the VHE-to-UHE gamma-ray source (LHAASO J0007+7303) detected by the LHAASO-WCDA and LHAASO-KM2A detector, located at the center of shell-type radio supernova remnant CTA 1. Above 25 TeV emission of LHAASO J0007+7303, detected by LHAASO KM2A detector, shows an extended morphology approximated by a 2D-Gaussion with a 39\% containment radius $\approx $ 0.16 $^\circ$. The photon spectrum of LHAASO J0007+7303 is well described by logparabola ($[dN/dE = N_0 \left(E/20\rm\ TeV \right)^{-(\alpha +\beta\ln(E/20\rm\ TeV))} ]$), with a differential spectral index $\alpha\approx 1.74$ and $\beta\approx 1.23$, and normalization $N_0\approx 2.54\times 10^{-15}\rm\ cm^{-2}\ s^{-1}\ TeV^{-1}$.The size and spectrum are coincident with the known TeV-PWN VER J0006+729 discovered by VERITAS gamma-ray observatory. We argue that the VHE-to-UHE gamma-ray emission of LHAASO J0007+7303 are originated from the leptonic emission of the relativistic particles within the PWN around PSR J0007+7303. The sizes are plausible to be evolution with photon energies, which favors that the convection transport of relativistic particles is dominant in this PWN.
