Radio observations of the remnant of the supernova of A.D. 1006. I - Total intensity observations

Abstract

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.