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

## TL;DR

This study analyzes Suzaku X-ray data to characterize the spectral components of Sgr A East and the Galactic center X-ray emission, revealing evidence of past flares from Sgr A* influencing the observed spectra.

## Contribution

It provides the first detailed spectral analysis of Sgr A East and the surrounding GCXE, identifying recombining plasma and power-law components linked to past Sgr A* activity.

## Key findings

- Sgr A East contains recombining plasma with Cr and Mn lines.
- The GCXE near Sgr A East is 1.5 times brighter than the average.
- Spectral features suggest past flares of Sgr A* caused observed plasma states.

## 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$^*$.