Uniform distribution of the extremely overionized plasma associated with the supernova remnant G359.1-0.5

Abstract

We report on the results of our detailed analyses on the peculiar recombining plasma of the supernova remnant (SNR) G359.1$-$0.5, and the interacting CO clouds. Combining {\it Chandra} and {\it Suzaku} data, we estimated the ionization state of the plasma with a careful treatment of the background spectrum. The average spectrum showed a remarkably large deviation of the electron temperature ($\sim$0.17 keV) from the initial temperature ($>$ 16 keV), indicating that the plasma is in a highly recombination-dominant state. On the other hand, the recombination timescale $(n_{\mathrm{e}}t)$ is comparable to those of the other recombining SNRs ($\sim 4.2\times 10^{11}$ cm${}^{-3}$ s). We also searched for spatial variation of the plasma parameters, but found no significant differences. Using ${}^{12}$CO($J$=2--1) data obtained with NANTEN2, we found a new, plausible candidate for the interacting CO cloud, which has a line-of-sight velocity of $\sim -$20 km s${}^{-1}$. This indicates that the SNR is located at a distance of $\sim$4 kpc, which is the foreground of the Galactic center, as previously reported. The associated CO cloud does not show clear spatial coincidence with the nearby GeV/TeV emission, indicating that the origins of the GeV/TeV emission are likely unrelated to G359.1$-$0.5.

arXiv comment26 pages, 12 figures. Accepted for ApJ

References in corpus (37)

• Monte-Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis
• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. I. Science goals, survey design and instrumentation
• The Hot and Energetic Universe: A White Paper presenting the science theme motivating the Athena+ mission
• Reproducibility of Non-X-ray Background for the X-ray Imaging Spectrometer aboard Suzaku
• A Parallax-based Distance Estimator for Spiral Arm Sources
• Study of the X-Ray Background Spectrum and its Large-Scale Fluctuation with ASCA
• A new approach to analyzing solar coronal spectra and updated collisional ionization equilibrium calculations. II. Additional ionization rate coefficients
• The Evolution of Supernovae in Circumstellar Wind-Blown Bubbles I. Introduction and One-Dimensional Calculations
• Ionization Equilibrium Timescales in Collisional Plasmas
• Suzaku Discovery of the Strong Radiative Recombination Continuum of Iron from the Supernova Remnant W49B
• New CTI Correction Method for the Spaced-Row Charge Injection of the Suzaku X-Ray Imaging Spectrometer
• Discovery of Strong Radiative Recombination Continua from The Supernova Remnant IC 443 with Suzaku
• ASCA Observations of the Supernova Remnant IC 443: Thermal Structure and Detection of Overionized Plasma
• Exploring a SNR/Molecular Cloud Association Within HESS J1745-303
• X-Ray Spectrum of a Peculiar Supernova Remnant G359.1-0.5
• The X-ray Structure and Spectrum of the Pulsar Wind Nebula Surrounding PSR B1853+01 in W44
• Chandra ACIS-I particle background: an analytical model
• Recombining Plasma and Hard X-ray Filament in the Mixed-Morphology Supernova Remnant W44
• Asymmetric Type-Ia supernova origin of W49B as revealed from spatially resolved X-ray spectroscopic study
• Discovery of the recombining plasma in the south of the Galactic center; a relic of the past Galactic center activity?
• Heartbeat of the Mouse: a young radio pulsar associated with the axisymmetric nebula G359.23-0.82
• HI, CO, and Dust in the Perseus Cloud
• Suzaku View of the Supernova Remnant RCW 86: X-Ray Studies of Newly-Discovered Fe-Rich Ejecta
• Deep X-Ray Observations of Supernova Remnants G359.1-0.5 and G359.0-0.9 with ASCA
• Discovery of Recombining Plasma in the Supernova Remnant 3C 391
• X-Ray Observation of Very High Energy Gamma-Ray Source, HESS J1745-303, with Suzaku
• Evidence for Rapid Adiabatic Cooling as an Origin of the Recombining Plasma in the Supernova Remnant W49B Revealed by NuSTAR Observations
• The Origin of Recombining Plasma and the Detection of the Fe-K Line in the Supernova Remnant W28
• Leaked GeV CRs from a broken shell: Explaining 9 years Fermi-LAT data of SNR W28
• Shocked molecular gas towards the SNR G359.1-0.5 and the Snake
• X-ray and Rotational Luminosity Correlation and Magnetic Heating of the Radio Pulsars
• Discovery of possible molecular counterparts to the infrared Double Helix Nebula in the Galactic center
• Global Distribution of Ionizing and Recombining Plasmas in the Supernova Remnant G290.1$-$0.8
• Molecular and Atomic Gas toward HESS J1745-303 in the Galactic Center: Further Support for the Hadronic Scenario
• Discovery of recombining plasma from the faintest GeV SNR HB 21 and a possible scenario of the cosmic ray escaping from SNR shocks
• Observing two dark accelerators around the Galactic Centre with Fermi Large Area Telescope
• Recombining Plasma & Gamma-ray Emission in the Mixed-morphology Supernova Remnant 3C 400.2

Cited by in corpus (10)

• Distances to the Supernova Remnants in the Inner Disk
• Quantitative Age Estimation of Supernova Remnants and Associated Pulsars
• Spatial and Temporal Variations of the Chandra ACIS Particle-Induced Background and Development of a Spectral-Model Generation Tool
• Observational constraints on the maximum energies of accelerated particles in supernova remnants: low maximum energies and a large variety
• Study on the escape timescale of high-energy particles from supernova remnants through thermal X-ray properties
• Spatially resolved study of the SS 433/W50 west region with Chandra: X-ray structure and spectral variation of non-thermal emission
• Spatially decomposed $\gamma$-ray features surrounding SNR Kes 79 & PSR J1853+0056
• On the formation of over-ionized plasma in evolved supernova remnants
• High Energy Emission from the Galactic Center
• Hadronic Scenario for Galactic PeVatron LHAASO J1912+1014u Supported by Fermi-LAT $\gamma$-ray Data and FUGIN CO Data