X-ray spectra of Sgr A East and diffuse X-ray background near the Galactic center

Abstract

This paper reports the analysis procedure and results of simultaneous spectral fits of the Suzaku archive data for Sagittarius (Sgr) A East and the nearby Galactic center X-ray emission (GCXE). The results are that the mixed-morphology supernova remnant Sgr A East has a recombining plasma (RP) with Cr and Mn He$\alpha$ lines, and a power-law component (PL) with an Fe I K$\alpha$ line. The nearby GCXE has a $\sim$1.5-times larger surface brightness than the mean GCXE far from Sgr A East, although the spectral shape is almost identical. Based on these results, we interpret that the origins of the RP and the PL with the Fe I K$\alpha$ line are past big flares of Sgr A${}^{\ast }$.

Accepted for publication in PASJ

References in corpus (5)

• A Catalog of Diffuse X-ray-Emitting Features within 20 pc of Sgr A*: Twenty Pulsar Wind Nebulae?
• Diffuse X-Ray Sky in the Galactic Center
• Origin of the Galactic Diffuse X-ray Emission: Iron K-shell Line Diagnostics
• Discovery of Enhanced Radiative Recombination Continua of He-like Iron and Calcium from IC 443 and Its Implications
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Cited by in corpus (6)

• 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 recombining plasma associated with the candidate supernova remnant G189.6+3.3 with Suzaku
• Hydrodynamic Evolution of Sgr A East: The Imprint of A Supernova Remnant in the Galactic Center
• Initial state of the recombining plasma in supernova remnant W 28
• A Complete X-ray View of Supernova Remnant W28 with Einstein Probe: Spatial Distribution of Parameters and Origin of the Thermal-Composite Morphology
• High Energy Emission from the Galactic Center