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Discovery of Outlying High-Velocity Oxygen-Rich Ejecta in Cassiopeia A

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


Analysis of broadband HST ACS and WFPC2 images of the young Galactic supernova remnant Cassiopeia A reveals a far larger population of outlying, high-velocity knots of ejecta with a broader range of chemical properties than previously suspected. In this paper, we concentrate on a ≃ 1.5 arcmin2 region located along the eastern limb of the remnant where we identify three main classes of outer ejecta: (1) knots dominated by [N II] λλ6548, 6583 emission, (2) knots dominated by oxygen emission...[Show more]

CollectionsANU Research Publications
Date published: 2006
Type: Journal article
Source: Astrophysical Journal, The
DOI: 10.1086/498092


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