N49: the first robust discovery of a recombining plasma in an extra galactic supernova remnant

Abstract

Recent discoveries of recombining plasmas (RPs) in supernova remnants (SNRs) have dramatically changed our understanding of SNR evolution. To date, a dozen of RP SNRs have been identified in the Galaxy. Here we present Suzaku deep observations of four SNRs in the Large Magellanic Cloud (LMC), N49, N49B, N23, and DEM L71, for accurate determination of their plasma state. Our uniform analysis reveals that only N49 is in the recombining state among them, which is the first robust discovery of a RP from an extra-galactic SNR. Given that RPs have been identified only in core-collapse SNRs, our result strongly suggests a massive star origin of this SNR. On the other hand, no clear evidence for a RP is confirmed in N23, from which detection of recombination lines and continua was previously claimed. Comparing the physical properties of the RP SNRs identified so far, we find that all of them are categorized into the "mixed-morphology" class and interacting with surrounding molecular clouds. This might be a key to solve formation mechanisms of the RPs.

8 pages, 4 figures, Accepted for publication in ApJ

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Cited by in corpus (16)

• Forbidden Iron Lines and Dust Destruction in Supernova Remnant Shocks: The Case of N49 in the Large Magellanic Cloud
• Progenitor Mass Distribution of Core-Collapse Supernova Remnants in Our Galaxy and Magellanic Clouds based on Elemental Abundances
• The Origin of Recombining Plasma and the Detection of the Fe-K Line in the Supernova Remnant W28
• Evidence for Rapid Adiabatic Cooling as an Origin of the Recombining Plasma in the Supernova Remnant W49B Revealed by NuSTAR Observations
• Deep XMM-Newton Observations Reveal the Origin of Recombining Plasma in the Supernova Remnant W44
• ALMA CO Observations of the Mixed-Morphology Supernova Remnant W49B: Efficient Production of Recombining Plasma and Hadronic Gamma-rays via Shock-Cloud Interactions
• Toward the Understanding of the Physical Origin of Recombining Plasma in the Supernova Remnant IC 443
• Localized Recombining Plasma in G166.0+4.3: A Supernova Remnant with an Unusual Morphology
• Hitomi Observations of the LMC SNR N132D: Highly Redshifted X-ray Emission from Iron Ejecta
• ALMA observations of supernova remnant N49 in the LMC: I. Discovery of CO clumps associated with X-ray and radio continuum shells
• Spatially-Resolved Study of Recombining Plasma in W49B Using XMM-Newton
• Evidence for Resonance Scattering in the X-ray Grating Spectrum of the Supernova Remnant N49
• High resolution X-ray study of supernova remnant J0453.6$-$6829 with unusually high forbidden-to-resonance ratio
• A Systematic Study of Evolved Supernova Remnants in the Large and Small Magellanic Clouds with Suzaku
• NuSTAR Detection of Quiescent Hard X-Ray Emission from SGR 0526-66 in the Large Magellanic Cloud
• On the formation of over-ionized plasma in evolved supernova remnants