M. E. Filho, J. Brinchmann, C. Lobo, S. Antón

Abstract
We have discovered eight relatively strong radio sources that have no optical counterparts. A NIR follow-up has detected faint (17–20 mag) host galaxies in all targets. In general, the radio properties are similar to those observed in 3CRR sources but the optical-radio slopes are consistent with moderate to high redshift (z < 4) GHz-peaked spectrum sources. Our results suggest that these are galaxies whose black hole has been recently re-ignited into activity but that retain large-scale radio structures, signatures of previous AGN activity.

Keywords
Galaxies: active

The Spectral Energy Distribution of Galaxies
Proceedings IAU Symposium No. 284
R. J. Tuffs, C. C. Popescu

Cambridge University Press
Volume 7, Page 231
2012 August

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