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. © 2012 International Astronomical Union.
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Filho, M. E., Brinchmann, J., Lobo, C., & Antón, S. (2011). Optically faint radio sources: Reborn AGN? In Proceedings of the International Astronomical Union (Vol. 7, pp. 231–233). https://doi.org/10.1017/S174392131200912X
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