Discovery of recombining plasma associated with the candidate supernova remnant G189.6+3.3 with Suzaku
Abstract
We present the results of an X-ray spectral analysis of the northeast region of the candidate supernova remnant G189.6+3.3 with Suzaku. K-shell lines from highly ionized Ne, Mg, Si, and S were detected in the spectrum for the first time. In addition, a radiative recombining continuum (RRC) from He-like Si was clearly seen near 2.5 keV. This detection of an RRC reveals for the first time that G189.6+3.3 possesses an X-ray-emitting recombining plasma (RP). The extracted X-ray spectrum in the 0.6&-10.0 keV energy band is well fitted with a model consisting of a collisional ionization equilibrium plasma component (associated with the interstellar medium) and an RP component (associated with the ejecta). The spectral feature shows that G189.6+3.3 is most likely to be a middle-aged SNR with an RP.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- October 2020
- DOI:
- 10.1093/pasj/psaa070
- arXiv:
- arXiv:2007.03226
- Bibcode:
- 2020PASJ...72...81Y
- Keywords:
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- ISM: individual objects (G189.6+3.3);
- ISM: supernova remnants;
- X-rays: ISM;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Accepted for publication in PASJ