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arXiv · 2307.08656

XMM-Newton observations of the TeV-discovered supernova remnant HESS J1534-571

N. T. Nguyen-Dang·G. Pühlhofer·M. Sasaki·A. Bamba·V. Doroshenko·A. Santangelo
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Abstract

We report the results obtained from XMM-Newton observations of the TeV-detected supernova remnant (SNR) HESS J1534-571. We focus on the nature of the cosmic-ray particle content in the SNR, which is revealed by its $\gamma$-ray emission. No signatures of X-ray synchrotron emission were detected from the SNR. This is consistent with earlier results obtained with Suzaku from other regions of the object. A joint modeling of the XMM-Newton and Suzaku spectra yields an upper limit for the total X-ray flux from the SNR area of $\sim$ 5.62$ \times 10^{-13} \ \mathrm{erg\ cm^{-2}\ s^{-1}}$ (95% c.l.) in the energy band of 2-10 keV, for an assumed photon index of 2.0. On the other hand, we do find evidence in the XMM-Newton data for a line-like emission feature at 6.4 keV from localized regions, again confirming earlier Suzaku measurements. We discuss the findings in the context of the origin of the observed $\gamma$-ray emission. Although neither hadronic nor leptonic scenarios can be fully ruled out, the observed line emission can be interpreted as the result of interactions between lower energy ($\sim$ MeV) cosmic-ray protons with high gas density regions in and around HESS J1534-571, and thus potentially be associated with particles accelerated in the SNR.

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N. T. Nguyen-Dang, G. Pühlhofer, M. Sasaki, A. Bamba, V. Doroshenko, A. Santangelo. 2023-07-17. XMM-Newton observations of the TeV-discovered supernova remnant HESS J1534-571. https://doi.org/10.1051/0004-6361/202346448

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