Abstract

Since their discovery, CSS and GPS sources have been growing in relevance. Although their nature is still not well understood, the latest studies show that these sources may be the progenitors of the large-scale powerful classical doubles. We have obtained long slit spectra of 3C67 and 3C277.1 with the HST/STIS spectrograph and present our preliminary results on the diagnostic emission line ratios along the radio source axes in 3C67 and 3C277.1.

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