Evidence for Recombining Plasma in the Supernova Remnant G346.6–0.2

We present Suzaku results of the supernova remnant (SNR) G346.6 $-$ 0.2. The X-ray emission has a center-filled morphology with a size of 6 $ '$ $ \times$ 8 $ '$ within the radio shell. Neither an ionization equilibrium nor non-equilibrium (ionizing) plasma can reproduce the spectra remain...

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Bibliographic Details
Published in:Publications of the Astronomical Society of Japan 2013-02, Vol.65 (1)
Main Authors: Yamauchi, Shigeo, Nobukawa, Masayoshi, Koyama, Katsuji, Yonemori, Manami
Format: Article
Language:English
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Summary:We present Suzaku results of the supernova remnant (SNR) G346.6 $-$ 0.2. The X-ray emission has a center-filled morphology with a size of 6 $ '$ $ \times$ 8 $ '$ within the radio shell. Neither an ionization equilibrium nor non-equilibrium (ionizing) plasma can reproduce the spectra remaining shoulder-like residuals in the 2–4 keV band. These structures are possibly due to a recombination of free electrons to the K-shell of He-like Si and S. The X-ray spectra were well-fitted with a plasma model in a recombination-dominant phase. We propose that the plasma was in a nearly full ionized state at a high temperature of $ \sim$ 5 keV, and then the plasma changed to a recombining phase due to selective cooling of electrons to a lower temperature of $ \sim$ 0.3 keV. G346.6 $-$ 0.2 would be in an epoch of the recombining phase.
ISSN:0004-6264
2053-051X
DOI:10.1093/pasj/65.1.6