Radio Expansion Studies of Two Historical Supernova Remnants: SN 1006 and SN 1572

MOFFETT, D. A.; CALDWELL, C.; REYNOSO, E. M.; HUGHES, J. P.

Simposio Nº218 de la IAU, "Young neutron stars and their environments", ASP Conference Proceedings, Eds. F. Camilo y B. Gaensler

Año: 2004 vol. 218 p. 69 - 70

0838-1178

We present results that trace the dynamics of two historical remnants, SN 1006 and SN 1572 (Tycho), for the past two decades. 21-cm radio images of each remnant were recorded during two previous epochs: 1983-1984 and 1991-1994. We obtained third-epoch images of both remnants from 2001 to 2003. After a direct comparison of images from these three epochs, we found the mean radio expansion rate of Tycho now agrees with a previous X-ray expansion study, and for the first time, we have measured the azimuthal expansion rate over the entire rim of SN 1006.