Toward the Understanding of the Physical Origin of Recombining Plasma in the Supernova Remnant IC 443

Abstract

We perform a spatially resolved spectroscopic analysis of X-ray emission from the supernova remnant (SNR) IC 443 with Suzaku. All the spectra are well reproduced by a model consisting of a collisional ionization equilibrium (CIE) and two recombining plasma (RP) components. Although previous X-ray studies found an RP in the northeastern region, this is the first report on RPs in the other parts of the remnant. The electron temperature $k{T}_e$ of the CIE component is almost uniform at $\sim 0.2$ keV across the remnant. The CIE plasma has metal abundances consistent with solar and is concentrated toward the rim of the remnant, suggesting that it is of shocked interstellar medium origin. The two RP components have different $k{T}_e$: one in the range of 0.16$-$0.28 keV and the other in the range of 0.48$-$0.67 keV. The electron temperatures of both RP components decrease toward the southeast, where the SNR shock is known to be interacting with a molecular cloud. We also find the normalization ratio of the lower-$k{T}_e$ RP to higher-$k{T}_e$ RP components increases toward the southeast. Both results suggest the X-ray emitting plasma in the southeastern region is significantly cooled by some mechanism. One of the plausible cooling mechanisms is thermal conduction between the hot plasma and the molecular cloud. If the cooling proceeds faster than the recombination timescale of the plasma, the same mechanism can account for the recombining plasma as well.

arXiv comment15 pages, 10 figures, 6 tables. Accepted for publication in ApJ on 16 Nov 2017

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• Deep XMM-Newton Observations Reveal the Origin of Recombining Plasma in the Supernova Remnant W44
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• ALMA CO Observations of the Mixed-Morphology Supernova Remnant W49B: Efficient Production of Recombining Plasma and Hadronic Gamma-rays via Shock-Cloud Interactions
• Discovery of a jet-like structure with overionized plasma in the SNR IC443
• Modeling the mixed-morphology supernova remnant IC 443. Origin of its complex morphology and X-ray emission
• Unveiling pure-metal ejecta X-ray emission in supernova remnants through their radiative recombination continuum
• Spatially Resolved Chandra Spectroscopy of the Large Magellanic Cloud Supernova Remnant N132D
• ALMA observations of supernova remnant N49 in the LMC: I. Discovery of CO clumps associated with X-ray and radio continuum shells
• Discovery of a Wind-Blown Bubble Associated with the Supernova Remnant G346.6-0.2: A Hint for the Origin of Recombining Plasma
• New Scenario of plasma evolution in IC 443
• Discovery of recombining plasma from the faintest GeV SNR HB 21 and a possible scenario of the cosmic ray escaping from SNR shocks
• Suzaku X-ray observations of the mixed-morphology supernova remnant CTB 1
• An XMM-Newton X-ray View of Supernova Remnant W49B: Revisiting its Recombining Plasmas and Progenitor Type
• Neutral iron line in the supernova remnant IC 443 and implications for MeV cosmic rays
• G189.6+03.3: the first complete X-ray view provided by SRG/eROSITA
• QUIJOTE scientific results -- V. The microwave intensity and polarisation spectra of the Galactic regions W49, W51 and IC443
• Discovery of recombining plasma associated with the candidate supernova remnant G189.6+3.3 with Suzaku
• On the formation of over-ionized plasma in evolved supernova remnants
• Investigation of the Physical Origin of Overionized Recombining Plasma in the Supernova Remnant IC 443 with XMM-Newton