Multi-antenna probing of absorbing regions inside and outside Cassiopeia A

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Fig. 5.

Impact of thermal absorption on the radio spectrum of Cas A, according to the spectral measurements at 8–66 MHz with NenuFAR and URAN–2 in the middle of 2023. Fitting of free-free absorption parameters in the model of Eqs. (1)–(4) indicates the contribution of different forms of absorption.

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