Suzaku observation and distance of supernova remnant G332.5-5.6

TL;DR

This study uses Suzaku X-ray data to analyze supernova remnant G332.5-5.6, determining its plasma properties, origin of X-ray emission, and estimating its distance and age.

Contribution

First detailed X-ray analysis of G332.5-5.6 providing plasma characteristics, origin of emission, and distance estimation.

Findings

Plasma characterized by a temperature of ~0.49 keV with subsolar abundances.

X-ray emission likely from projection effects or cloud evaporation.

Estimated distance of 3.0 ± 0.8 kpc and age of 7-9 kyr.

Abstract

We analyze the Suzaku XIS data of the central region of supernova remnant G332.5-5.6. The X-ray data are well described by a single non-equilibrium ionization thermal model, {\tt vnei}, with an absorbing hydrogen column density of 1.4$^{+0.4}_{-0.1}$ $\times$ 10$^{21}$ cm$^{-2}$. The plasma is characterized by an electron temperature of 0.49$^{+0.08}_{-0.06}$ keV with subsolar abundances for O (0.58$^{+0.06}_{-0.05}$ solar value) and Fe (0.72$^{+0.06}_{-0.05}$ solar value) and slightly overabundance for Mg (1.23$^{+0.14}_{-0.14}$ solar value). It seems that the central X-ray emission originates from projection effect or evaporation of residual clouds inside G332.5-5.6. We estimate a distance of 3.0 $\pm$ 0.8 kpc for G332.5-5.6 based on the extinction-distance relation. G332.5-5.6 has an age of 7 - 9 kyr.