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The Expansion Asymmetry and Age of the Cassiopeia A Supernova Remnant

Fesen, Robert A; Hammell, Molly; Morse, Jon; Chevalier, Roger A; Borkowski, Kazimierz J; Dopita, Michael; Gerardy, Christopher L; Lawrence, Stephen S; Raymond, John C; van den Bergh, Sidney


HST images of the young supernova remnant Cas A are used to explore the expansion and spatial distribution of its highest velocity debris. ACS WFC images taken in 2004 March and December with Sloan F625W, F775W, and F850LP filters were used to identify 1825 high-velocity, outlying ejecta knots through measured proper motions of 0″.35-0″.90 yr-1, corresponding to Vtrans = 5500-14,500 km s-1 assuming d = 3.4 kpc. The distribution of derived transverse expansion velocities for these ejecta knots...[Show more]

CollectionsANU Research Publications
Date published: 2006
Type: Journal article
Source: Astrophysical Journal, The
DOI: 10.1086/504254


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