Abstract
VLBA observations at 18 cm are presented for 28 Compact Steep–spectrum radio Sources (CSSs) from the B3–VLA CSS sample. These sources were unresolved in previous VLA observations at high frequencies or their brightness distribution was dominated by an unresolved steep spectrum component. More than half of them also showed a low frequency turnover in their radio spectrum. The VLBA images display in most cases a compact symmetric structure. Only in a minority of cases complex morphologies are present.
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