Arias, M.; Vink, J.; de Gasperin, Francesco; Salas, P.; Oonk, J. B. R.; van Weeren, R. J.; van Amesfoort, A. S.; Anderson, J. M.; Beck, Rainer; Bell, M. E.; Butcher, Harvey
Context. Cassiopeia A is one of the best-studied supernova remnants. Its bright radio and X-ray emission is due to shocked ejecta. Cas A is rather unique in that the unshocked ejecta can also be studied: through emission in the infrared, the radio-active decay of 44Ti, and the low-frequency free-free absorption caused by cold ionised gas, which is the topic of this paper.
Aims. Free-free absorption processes are affected by the mass, geometry, temperature, and ionisation conditions in the...[Show more]
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