Recombining Plasma and Gamma-Ray Emission in the Mixed-morphology Supernova Remnant 3C 400.2

3C 400.2 belongs to the mixed-morphology supernova remnant class, showing center-filled X-ray and shell-like radio morphology. We present a study of 3C 400.2 with archival Suzaku and Fermi-LAT observations. We find recombining plasma (RP) in the Suzaku spectra of north-east and south-east regions. T...

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Bibliographic Details
Published in:The Astrophysical journal 2017-06, Vol.842 (1), p.22
Main Authors: Ergin, T., Sezer, A., Sano, H., Yamazaki, R., Fukui, Y.
Format: Article
Language:English
Subjects:
ABUNDANCE
Astrophysical observatories
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CARBON
CARBON MONOXIDE
CLOUDS
Ejecta
EMISSION
EQUILIBRIUM
Gamma emission
GAMMA RADIATION
Gamma ray sources
Gamma rays
GAMMA SOURCES
gamma-rays: ISM
GEV RANGE
HARD COMPONENT
Interstellar matter
IONIZATION
ISM: clouds
ISM: individual objects (G53.6-2.2, 3C 400.2)
ISM: supernova remnants
Morphology
PLASMA
Power law
SOFT COMPONENT
Supernova
SUPERNOVA REMNANTS
Supernovae
Thermal plasmas
X RADIATION
X ray analysis
X ray spectra
X-ray emissions
X-rays: ISM
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Summary:3C 400.2 belongs to the mixed-morphology supernova remnant class, showing center-filled X-ray and shell-like radio morphology. We present a study of 3C 400.2 with archival Suzaku and Fermi-LAT observations. We find recombining plasma (RP) in the Suzaku spectra of north-east and south-east regions. The spectra of these regions are well described by two-component thermal plasma models: the hard component is in RP, while the soft component is in collisional ionization equilibrium (CIE) conditions. The RP has enhanced abundances, indicating that the X-ray emission has an ejecta origin, while the CIE has solar abundances associated with the interstellar material. The X-ray spectra of north-west and south-west regions are best fitted by a two-component thermal plasma model: an ionizing and a CIE plasma. We have detected GeV gamma-ray emission from 3C 400.2 at the level of ∼5 , assuming a point-like source model with a power-law (PL) type spectrum. We have also detected a new GeV source at the level of ∼13 , assuming a Gaussian extension model with a PL-type spectrum in the neighborhood of the supernova remnant. We report the analysis results of 3C 400.2 and the new extended gamma-ray source, and discuss the nature of gamma-ray emission of 3C 400.2 in the context of existing NANTEN CO data, Dominion Radio Astrophysical Observatory H i data, and the Suzaku X-ray analysis results.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aa72ee