Abstract:
We have observed the type 1.5 Seyfert galaxy NGC 7213 with the Australian Long Baseline
Array (LBA) at 8.4 GHz to discover whether this object has the high brightness temperature
compact core suggested by low-frequency variability. Confirmation would support the hypothesis
that radio-intermediate Seyfert galaxies have Doppler-boosted radio jets. Our observation
confirms the existence of this core but with a flux density of almost a factor of 6 less than
observed 12 yr earlier. Though few studies exist on the long-term radio variability of Seyferts,
a decline of this magnitude does appear to be rare.
