Non-thermal emission from the vicinity of the magnetar CXOU J171405.7-381031

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ID: 321253
2026
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Abstract
Abstract Magnetars are neutron stars with ultra-strong magnetic fields (B ~ 1014–1015 G) and are promising candidates for high-energy particle acceleration. We present a multiwavelength analysis of the region surrounding CXOU J171405.7–381031, a magnetar associated with the supernova remnant (SNR) CTB 37B. The broadband spectral energy distribution spanning radio to TeV energies is modeled using leptonic and lepto-hadronic scenarios, with particle populations constrained using Markov Chain Monte Carlo techniques. Within an SNR framework, both scenarios provide acceptable descriptions of the gamma-ray data. The purely leptonic model reproduces the overall spectral shape but slightly underestimates the highest-energy flux measured by H.E.S.S., whereas a lepto-hadronic interpretation offers an improved description above ~10 TeV, with inverse-Compton scattering dominating the GeV emission and neutral-pion decay contributing at the highest energies. The required proton energy (Wp ≳ 1051 erg) can be substantially reduced if the remnant interacts with a dense ambient medium. A magnetar wind nebula scenario can reproduce the broadband spectrum but is strongly disfavored by the observed source morphology. Simulated Cherenkov Telescope Array Observatory (CTAO) observations indicate that exposures of ~50 h will constrain the proton cut-off energy, enabling a decisive test of hadronic emission in this region.
Reference Key
openalex_W7169081746 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors M. F. Sousa, Rita C Anjos
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1351
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