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

E. SÁNCHEZ-AYASO; J.A. COMBI; J.F. ALBACETE COLOMBO; J. LÓPEZ-SANTIAGO; J. MARTÍ; A.J. MUÑOZ-ARJONILLA

ASTROPHYSICS AND SPACE SCIENCE

SPRINGER

Lugar: Paris; Año: 2012 vol. 337 p. 573 - 579

0004-640X

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 (NH ∼ 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 NH is consistent with that of G296.8-0.3, which suggests a physical connexion with the SNR.