Expansion studies of two historical SNRs: SN1006 and SN1572

MOFFETT, D. A.; ESTELA MARTA REYNOSO; HUGHES, J. P.

Sydney (Australia)

Simposio; Simposio Nº 218 de la Unión Astronómica Internacional: “Young neutron stars and their environments"; 2003

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.