High resolution X-ray study of supernova remnant J0453.6$-$6829 with unusually high forbidden-to-resonance ratio

Abstract

Recent high-resolution X-ray spectroscopy has revealed that several supernova remnants (SNRs) in the Large Magellanic Cloud (LMC) show unusually high forbidden-to-resonance ($f/r$) line ratios. While their origin is still uncertain and debated, most of these SNRs have asymmetric morphology and/or show evidence of interaction with dense material, which may hint at the true nature of the anomalous $f/r$ ratios. Here we report on a detailed spectral analysis of an LMC SNR J0453.6$-$6829 with the Reflection Grating Spectrometer (RGS) onboard XMM-Newton. We find that the $f/r$ ratio of O VII ($=1.06_{-0.10}^{+0.09}$) is significantly higher than expected from the previously-reported thermal model. The spectrum is fairly explained by taking into account a charge exchange (CX) emission in addition to the thermal component. Analyzing archival ATCA & Parkes radio data, we also reveal that H I cloud is possibly interacting with J0453.6$-$6829. These results support the presence of CX in J0453.6$-$6829, as the origin of the obtained high $f/r$ ratio. Although a contribution of the resonance scattering (RS) cannot be ruled out at this time, we conclude that CX seems more likely than RS considering the relatively symmetric morphology of this remnant.

10 pages, 10 figures, 3 tables, accepted for publication in PASJ

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Cited by in corpus (3)

• Scientific Objectives of the Hot Universe Baryon Surveyor (HUBS) Mission
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• Unusual X-ray Oxygen Line Ratios of SN 1987A Arising From the Absorption of Galactic Hot Interstellar Medium