Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 356, Issue 2, Pages 734-736Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.08506.x
Keywords
techniques : interferometric; galaxies : individual : NGC 7213; galaxies : Seyfert; radio continuum : galaxies
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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.
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