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

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${}_{-0.1}^{+0.4}$ $\times$ 10${}^{21}$ cm${}^{-2}$. The plasma is characterized by an electron temperature of 0.49${}_{-0.06}^{+0.08}$ keV with subsolar abundances for O (0.58${}_{-0.05}^{+0.06}$ solar value) and Fe (0.72${}_{-0.05}^{+0.06}$ 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.

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