On the Unusually Large Spatial Extent of the TeV nebula HESS J1825-137: Implication from the Energy-Dependent Morphology

Abstract

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., $\gtrsim 100$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.

11 pages, 10 figures, section 4 has been significantly rewritten; accepted by MNRAS

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Cited by in corpus (9)

• Investigating the nature of MGRO J1908+06 with multiwavelength observations
• Investigating $\gamma$-ray halos around three HAWC bright sources in Fermi-LAT data
• Morphology of Gamma-Ray Halos around Middle-Aged Pulsars: Influence of the Pulsar Proper Motion
• Ultra-High-Energy Gamma-Ray Astronomy
• Revisiting the Chandra Observation on the Region of PSR J1809-1917: Indication of an X-ray Halo and Implication for the Origin of HESS J1809-193
• An extreme particle accelerator powered by pulsar PSR J1849-0001
• Explaining the extended GeV gamma-ray emission adjacent to HESS J1825-137
• Diagnosing Interstellar Magnetic Turbulence with TeV Pulsar Halos
• Magnetohydrodynamic turbulence and propagation of cosmic rays: theory confronted with observations