Speaker
Description
The 508 days observation by LHAASO/WCDA presents a significant detection with test statistic is TS ∼8 with best-fit photon spectral index Γ = 2.81 ± 0.15 and a flux F>0.5TeV approximately ∼ 30% of the Crab Nebula. The best fit position of the TeV source is compatible with the young radio galaxy, the compact symmetric object (CSO) NGC 4278 within ∼ 0.03 degree. Variation analysis presents only moderate variability on timescale of months at TeV band, which is consistent with low frequency observations. The weak radio emission (∼ 10^38−39 erg s^−1), small jet size (∼ 3 pc) and kinematic age (< 100 yr) make NGC 4278 and establish the very compact and young CSOs as capacity to produce TeV emissions, and yield insight on the physical process in the compact radio jets and the interaction with the interstellar medium of the host galaxy.
