A multiwavelength study of the supernova remnant G296.8-0.3

作者：Sanchez Ayaso E^*; Combi J A; Albacete Colombo J F; Lopez Santiago J; Marti J; Munoz Arjonilla A J

来源：Astrophysics and Space Science, 2012, 337(2): 573-579.

DOI：10.1007/s10509-011-0886-4

• ISM: individual objects: G296.8-0.3
• ISM: supernova remnants
• X-ray: ISM
• Radiation mechanism: thermal
• ISM: individual objects: 2XMMi J115836.1-623516

We report XMM-Newton observations of the Galactic supernova remnant G296.8-0.3, together with complementary radio and infrared data. The spatial and spectral properties of the X-ray emission, detected towards G296.8-0.3, was investigated in order to explore the possible evolutionary scenarios and the physical connexion with its unusual morphology detected at radio frequencies. G296.8-0.3 displays diffuse X-ray emission correlated with the peculiar radio morphology detected in the interior of the remnant and with the shell-like radio structure observed to the northwest side of the object. The X-ray emission peaks in the soft/medium energy range (0.5-3.0 keV). The X-ray spectral analysis confirms that the column density is high (N-H similar to 0.64 x 10(22) cm(-2)) which supports a distant location (d %26gt; 9 kpc) for the SNR. Its X-ray spectrum can be well represented by a thermal (PSHOCK) model, with kT similar to 0.86 keV, an ionization timescale of 6.1 x 1010 cm(-3) s, and low abundance (similar to 0.12 Z(circle dot)). The 24 mu m observations show shell-like emission correlated with part of the northwest and southeast boundaries of the SNR. In addition a point-like X-ray source is also detected close to the geometrical center of the radio SNR. The object presents some characteristics of the so-called compact central objects (CCO). Its X-ray spectrum is consistent with those found at other CCOs and the value of N-H is consistent with that of G296.8-0.3, which suggests a physical connexion with the SNR.

• 出版日期2012-2