A multiwavelength study of the supernova remnant G296.8-0.3
Abstract
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∼0.64×1022 cm-2) which supports a distant location ( d>9 kpc) for the SNR. Its X-ray spectrum can be well represented by a thermal (PSHOCK) model, with kT∼0.86 keV, an ionization timescale of 6.1×1010 cm-3 s, and low abundance (∼0.12 Z ⊙). The 24 μm 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.
- Publication:
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Astrophysics and Space Science
- Pub Date:
- February 2012
- DOI:
- 10.1007/s10509-011-0886-4
- arXiv:
- arXiv:1110.1272
- Bibcode:
- 2012Ap&SS.337..573S
- Keywords:
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- ISM: individual objects: G296.8-0.3;
- ISM: supernova remnants;
- X-ray: ISM;
- Radiation mechanism: thermal;
- ISM: individual objects: 2XMMi J115836.1-623516;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Accepted for publication in Astrophysics &