Abstract
We consider linear algorithms of multi-frequency image synthesis and analysis for very-long baseline interferometry (VLBI). Compared with the existing algorithms of multi-frequency synthesis, the developed algorithm allows one to obtain the spectral-index map simultaneously with the map of a radio source for any value of the reference frequency within a given frequency band. In addition, there exists an opportunity to obtain a spectral estimate for any given part of the image. Some examples of the multi-frequency image retrieval for the quasar 3C84 are presented.
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