Arias, Maria; Vink, J; De Gasperin, F; Salas, P; Oonk, JBR; Van Weeren, RJ; Van Amesfoort, AS; Anderson, J; Beck, R; Bell, ME; Bentum, MJ; Best, P; Blaauw, R; Breitling, F; Broderick, JW; Brouw, WN; Bruggen, M; Butcher, HR; Ciardi, B; De Geus, E; Deller, A; Van Dijk, PCG; Duscha, S; Eisloffel, J; Garrett, MA; Grie?meier, JM; Gunst, AW; Van Haarlem, MP; Heald, G; Hessels, J; Horandel, J; Holties, HA; Van Der Horst, AJ; Iacobelli, M; Juette, E; Krankowski, A; Van Leeuwen, J; Mann, G; McKay, Derek; McKean, JP; Mulder, H; Nelles, A; Orru, E; Paas, H; Pandey-Pommier, M; Pandey, VN; Pekal, R; Pizzo, R; Polatidis, AG; Reich, W; Rottgering, HJA; Rothkaehl, H; Schwarz, DJ; Smirnov, O; Soida, M; Steinmetz, M; Tagger, M; Thoudam, S; Toribio, MC; Vocks, C; Van Der Wiel, MHD; Wijers, RAMJ; Wucknitz, O; Zarka, P; Zucca, Philippe M. (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-08)
<i>Context</i>: 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
<sup>44</sup>Ti, and the low-frequency free-free absorption caused by cold ionised gas, which is the topic of this paper.<p>
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