The Changing Morphology and Increasing Deceleration of Supernova 1993J in M81

Details The Changing Morphology and Increasing Deceleration of Supernova 1993J in M81 The Changing Morphology and Increasing Deceleration of Supernova 1993J in M81

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000sci...287..112b&link_type=abstract

Science, Volume 287, Issue 5450, pp. 112-116 (2000).

Astronomy and Astrophysics

Astronomy

41

Scientific paper

Twenty consecutive Very Long Baseline Interferometry images of supernova 1993J from the time of explosion to the present show the dynamic evolution of the expanding radio shell of an exploded star. High-precision astrometry reveals that the supernova expands isotropically from its explosion center. Systematic changes in the images may reflect a pattern of anisotropies and inhomogeneities in the material left over from the progenitor star. As the shock front sweeps up the material in the surrounding medium, it is increasingly decelerated and influenced by the material. After 5 years, the supernova has slowed to half of its original expansion velocity and may have entered the early stages of the adiabatic phase common in much older supernova remnants in the Milky Way Galaxy.

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