Abstract
We have observed the supernova remnant 3C400.2 with the very large array (VLA) at 327.5 and 1465 MHz. The images, obtained with an angular resolution better than 1 min and a sensitivity of 1 mJy/beam, show significant new features that suggest that the radio remnant may be formed by two highly symmetrical circular shells that overlap in the northwest. The x-ray emitting region fills the interior of the radio shells, peaking in the region where the radio continuum synchrotron rings overlap. A detailed spatial correlation of optical filaments with the newly discovered radio features is found. Two different scenarios consistent with the observed morphologies are proposed: (a) 3C400.2 is the result of an explosion occurring inside the wind-driven bubble excavated by a massive progenitor star, or (b) the distribution of the emission observed in the different spectral ranges is the signature of two different SN explosions.
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