Broadband X-ray Spectroscopy of the Pulsar Wind Nebula in HESS J1640-465

Abstract

We present updated measurements of the X-ray properties of the pulsar wind nebula associated with the TeV $\gamma$-ray source HESS J1640-465 derived from Chandra & NuSTAR data. We report a high $N_H$ value along line of sight, consistent with previous work, which led us to incorporate effects of dust scattering in our spectral analysis. Due to uncertainties in the dust scattering, we report a range of values for the PWN properties (photon index and un-absorbed flux). In addition, we fit the broadband spectrum of this source and found evidence for spectral softening and decreasing unabsorbed flux as we go to higher photon energies. We then used a one zone time dependent evolutionary model to reproduce the dynamical and multi-wavelength spectral properties of our source. Our model suggests a short spin-down time scale, a relatively higher than average magnetized pulsar wind, a strong PWN magnetic field and maximum electron energy up to PeV, suggesting HESS J1640-465 could be a PeVatron candidate.

14 pages, 7 figures, 10 tables. Accepted for publication in ApJ

References in corpus (12)

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Cited by in corpus (3)

• Analysis of the possible detection of the pulsar wind nebulae of PSR J1208-6238, J1341-6220, J1838-0537 and J1844-0346
• NuSTAR and XMM-Newton Observations of PSR J1930+1852 and Its Pulsar Wind Nebula
• New Hard X-Ray and Multiwavelength Study of the PeVatron Candidate PWN G0.9+0.1 in the Galactic Center Region