Revealing a new region of gamma-ray emission in the vicinity of HESS J1825-137

Abstract

HESS J1825-137 is a bright very-high-energy (VHE) gamma-ray source that has been firmly established as a pulsar wind nebula (PWN), and one of the most extended gamma-ray objects within this category. The progenitor supernova remnant (SNR) for this PWN has not been firmly established. We carried out an analysis of gamma-ray observations in the region of HESS J1825-137 with the Fermi-LAT which reveal emission in the direction away from the Galactic plane. The region lies beyond the PWN and reaches a distance from the pulsar compatible with the supposed location of the SNR shock front. The spectrum of the gamma-rays is hard with a photon index of $\sim 1.9$ in the 10-250 GeV range. Several scenarios for the origin of the emission are discussed, including the SNR as a source of high-energy particles and the "leakage"' of leptons from the PWN.

arXiv commentTo be published in MNRAS

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Cited by in corpus (4)

• Incremental Fermi Large Area Telescope Fourth Source Catalog
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• Explaining the extended GeV gamma-ray emission adjacent to HESS J1825-137
• The primary proton spectrum of the hadronic PeVatron candidate HAWC J1825-134