Probing the Properties of the Pulsar Wind in the Gamma-Ray Binary HESS J0632+057 with NuSTAR and VERITAS Observations. (arXiv:1911.09434v1 [astro-ph.HE])

Probing the Properties of the Pulsar Wind in the Gamma-Ray Binary HESS J0632+057 with NuSTAR and VERITAS Observations. (arXiv:1911.09434v1 [astro-ph.HE])
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HESS J0632+057 is a gamma-ray binary composed of a compact object orbiting a
Be star with a period of about $315$ days. Extensive X-ray and TeV gamma-ray
observations have revealed a peculiar light curve containing two peaks,
separated by a dip. We present the results of simultaneous observations in hard
X-rays with NuSTAR and in TeV gamma-rays with VERITAS, performed in November
and December 2017. These observations correspond to the orbital phases
$phiapprox0.22$ and $0.3$, where the fluxes are rising towards the first
light-curve peak. A significant variation of the spectral index from
1.77$pm$0.05 to 1.56$pm$0.05 is observed in the X-ray data. The
multi-wavelength spectral energy distributions (SED) derived from the
observations are interpreted in terms of a leptonic model, in which the compact
object is assumed to be a pulsar and non-thermal radiation is emitted by
high-energy electrons accelerated at the shock formed by the collision between
the stellar and pulsar wind. The results of the SED fitting show that our data
can be consistently described within this scenario, and allow us to estimate
the magnetization of the pulsar wind at the location of the shock formation.
The constraints on the pulsar-wind magnetization provided by our results are
shown to be consistent with those obtained from other systems.

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