Kavli Affiliate: Li Xin Li
| First 5 Authors: Zhen Cao, F. Aharonian, Y. X. Bai, Y. W. Bao, D. Bastieri
| Summary:
In this study, we present a comprehensive analysis of an unidentified
point-like ultra-high-energy (UHE) $gamma$-ray source, designated as 1LHAASO
J1740+0948u, situated in the vicinity of the middle-aged pulsar PSR J1740+1000.
The detection significance reached 17.1$sigma$ (9.4$sigma$) above 25$,$TeV
(100$,$TeV). The source energy spectrum extended up to 300$,$TeV, which was
well fitted by a log-parabola function with $N0 = (1.93pm0.23) times 10^{-16}
rm{TeV^{-1},cm^{-2},s^{-2}}$, $alpha = 2.14pm0.27$, and $beta =
1.20pm0.41$ at E0 = 30$,$TeV. The associated pulsar, PSR J1740+1000, resides
at a high galactic latitude and powers a bow-shock pulsar wind nebula (BSPWN)
with an extended X-ray tail. The best-fit position of the gamma-ray source
appeared to be shifted by $0.2^{circ}$ with respect to the pulsar position. As
the (i) currently identified pulsar halos do not demonstrate such offsets, and
(ii) centroid of the gamma-ray emission is approximately located at the
extension of the X-ray tail, we speculate that the UHE $gamma$-ray emission
may originate from re-accelerated electron/positron pairs that are advected
away in the bow-shock tail.
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