Answers are grounded in this paper and cite their sources.
VLA observations are presented of the supernova of A.D. 1006 at 1370 and 1665 MHz with 16 x 20 arcsec resolution. A circular shell whose peak brightness varies by a factor of about 11 with azimuth is seen, with two bright regions dominating the emission; these have extremely sharp outer edges. Several discrete filaments can be followed for substantial portions of the remnant diameter.
No takes yet. Share an insight, caveat, or question.
Reynolds et al. (1986) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: