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While studying the techniques astronomers use to mitigate radio frequency interference (RFI) I found it's often assumed that astronomical signals are (band-limited) Gaussian noise. Is this a reasonable assumption for every type of astronomical observation? Even when searching EM emission from specific elements (e.g. hydrogen line)?

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    $\begingroup$ Not necessarily. Photon counting in CCDs often assumes Poisson noise/statistics. $\endgroup$ – zephyr Sep 6 '16 at 17:40

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