Pulsars (a notable exception to this is SN 1987A, where no compact Nebula has ever been observed in the remnant, whereas many knownĬore-collapse (CC) SNRs in the LMC do have known neutron stars or Finally, no compact remnant or pulsar wind They suggest that the structure of the remnant may beĭue to CSM interaction. Relatively young, massive progenitor with substantial mass loss prior ( 2009) favor a Type Ia SNR, noting that the remnant isĪssociated with a region of the LMC that underwent recent starįormation, implying that the progenitor, like Kepler, might have had a Spectrum and their relative strength compared to Fe. Type Ia origin based on the strength of Cr and Mn lines in the Of Type Ia SNRs in both the LMC and the Galaxy. That the overall shape of the emission was more consistent with that Statistical analysis of the morphology of the remnant and concluded ( 1995) examined ASCA spectra and found a highįe/O ratio in the X-ray spectra. Arguments for a Type Ia origin have been made by severalĪuthors. Relatively unevolved at the time of the explosion.Īlso known as SNR 0509-68.7, N103B is not without its share ofĬontroversy. Of Type Ia remnants characterized by interaction with a dense CSM Remnant would become the second member, along with Kepler, of a class If the CSM interpretation is correct, this The dense material is circumstellar material lost from the progenitor Silicate feature that peaks instead at 17.3 μm. Standard silicate dust models fail to reproduce the “18 μm” The entire periphery of the western portion of the shock, with Īnd lines emitted from a few dense clumps of material where the Thisĭensity is similar to that in Kepler’s SNR, a Type Ia interacting withĪ circumstellar medium. Measurements towards regions of higher than average density. Remnants in the LMC, though a lack of spatial resolution may bias The post-shock gasĭensity we derive, 45 cm − 3, is much higher than in other Type Ia Our images show that N103B has strong IR emissionįrom warm dust in the post-shock environment. Magellanic Cloud that shows interaction with a dense medium in its We report results from Spitzer observations of SNR 0509-68.7,Īlso known as N103B, a young Type Ia supernova remnant in the Large
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