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

Author:

Koshiba Yosuke1ORCID,Uchida Hiroyuki1,Tanaka Takaaki2,Amano Yuki1,Sano Hidetoshi3,Tsuru Takeshi Go1

Affiliation:

1. Department of Physics, Kyoto University , Kitashirakawa Oiwake-cho, Sakyo, Kyoto, Kyoto 606-8502, Japan

2. Department of Physics, Konan University , 8-9-1 Okamoto, Higashinada, Kobe, Hyogo 658-8501, Japan

3. National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

Abstract

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 the LMC SNR J0453.6−6829 with the Reflection Grating Spectrometer (RGS) onboard XMM-Newton. We find that the f/r ratio of O vii ($=1.06^{+0.09}_{-0.10}$) is significantly higher than expected from the previously reported thermal model. The spectrum is suitably explained by taking into account a charge exchange (CX) emission in addition to the thermal component. Analyzing archival ATCA and Parkes radio data, we also reveal that an 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.

Funder

SNR

CSIRO

JSPS

MEXT

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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