TY  - JOUR
A1  - Liu, Ruoyu
A1  - Yan, Huirong
T1  - On the unusually large spatial extent of the TeV nebula HESS J1825-137
BT  - implication from the energy-dependent morphology
JF  - Monthly notices of the Royal Astronomical Society
N2  - Deep observation of the High Energy Stereoscopic System (HESS) on the most extended pulsar wind nebula HESS J1825-137 reveals an enhanced energy-dependent morphology, providing useful information on the particle transport mechanism in the nebula. We find that the energy-dependent morphology is consistent with a diffusion-dominated transport of electrons/positrons. It provides an alternative possible interpretation for the unusually large spatial extent (i.e. greater than or similar to 100 pc) of the nebula, which could then be attributed to the diffusion of escaping electrons/positrons from a compact plerion. The influence of various model parameters on the energy-dependent extent of the nebula is studied in the diffusion-dominated scenario. We also show that the energy-dependent morphology of the nebula may also be used to study the spin-down history of the pulsar.
KW  - diffusion-radation mechanisms
KW  - non-thermal-pulsars
KW  - individual
KW  - HESS J1825-137 gamma-rays
KW  - general
Y1  - 2020
U6  - https://doi.org/10.1093/mnras/staa911
SN  - 0035-8711
SN  - 1365-2966
VL  - 494
IS  - 2
SP  - 2618
EP  - 2627
PB  - Oxford Univ. Press
CY  - Oxford
ER  -