An X-ray characterization of the central region of the supernova remnant G332.5-5.6

SUÁREZ, ALEJANDRA E.; COMBI JORGE A.; ALBACETE COLOMBO FACUNDO; PARON SERGIO; GARCÍA FEDERICO; MICELI MARCO

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Lugar: Paris; Año: 2015 vol. 583

0004-6361

Aims. We present an X-ray analysis of the central region of supernova remnant (SNR) G332.5−5.6 through an exhaustive analysis ofXMM-Netwon observations with complementary infrared observations. We characterize and discuss the origin of the observed X-raymorphology, which presents a peculiar plane edge over the west side of the central region.Methods. The morphology and spectral properties of the X-ray SNR were studied using a single full frame XMM-Newton observationin the 0.3 to 10.0 keV energy band. Archival infrared WISE observations at 8, 12 and 24 μm were also used to investigate the propertiesof the source and its surroundings at different wavelengths.Results. The results show that the extended X-ray emission is predominantly soft (0.3−1.2 keV) and peaks around 0.5 keV, whichshows that it is an extremely soft SNR. X-ray emission correlates very well with central regions of bright radio emission. On thewest side the radio/X-ray emission displays a plane-like feature with a terminal wall where strong infrared emission is detected. Ourspatially resolved X-ray spectral analysis confirms that the emission is dominated by weak atomic emission lines of N, O, Ne, and Fe,all of them undetected in previous X-ray studies. These characteristics suggest that the X-ray emission is originated in an opticallythin thermal plasma, whose radiation is well fitted by a non-equilibrium ionization collisional plasma (VNEI) X-ray emission model.Our study favors a scenario where G332.5-5.6 is expanding in a