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Optically faint radio sources: reborn AGN?

Published online by Cambridge University Press:  17 August 2012

Mercedes E. Filho ,
Jarle Brinchmann ,
Catarina Lobo  and
Sonia Antón
Mercedes E. Filho
Affiliation:
CAUP, Rua das Estrelas, 4150–762 Porto, Portugal
Jarle Brinchmann
Affiliation:
CAUP, Rua das Estrelas, 4150–762 Porto, Portugal Leiden Observatory, University of Leiden, PO Box 9513, NL–2300 RA Leiden, The Netherlands
Catarina Lobo
Affiliation:
CAUP, Rua das Estrelas, 4150–762 Porto, Portugal Departamento de Física e Astronomia, FCUP, Rua do Campo Alegre, 687, 4169–007, Porto, Portugal
Sonia Antón
Affiliation:
CICGE, FCUP, Porto, Porto, Portugal SIM, FCUL, Lisboa, Portugal email: [email protected]
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Abstract

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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
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 231 - 233
Copyright
Copyright © International Astronomical Union 2012

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