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Study of Spectral Energy Distributions of low-luminosity radio galaxies at z ~ 1–3: a high-z view of the host/AGN connection

Published online by Cambridge University Press:  25 July 2014

Ranieri D. Baldi ,
Marco Chiaberge  and
Alessandro Capetti
Ranieri D. Baldi
Affiliation:
SISSA, via Bonomea 265, 34136 Trieste, Italy email: rbaldi@sissa.it
Marco Chiaberge
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Alessandro Capetti
Affiliation:
INAF-Osservatorio Astronomico di Torino, Strada Osservatorio 20, 10025 Pino Torinese, Italy
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Abstract

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Low-luminosity radio galaxies, common in the local Universe, are associated with giant elliptical galaxies and typically with a FR I radio morphology. However, they are rare in flux-limited samples of distant radio-loud (RL) AGN due to a selection bias. Chiaberge et al. (2009) selected the first sizeable sample of FRI candidates at 1<z<3, in the COSMOS field. We study the Spectral Energy Distributions (SEDs) of this low radio power sample from the far-UV to the Mid-IR wavelengths. Our results show that the hosts of these high-z low-luminosity radio sources are old massive galaxies, similar to the local FR Is. However, for half of the sample the UV and MIR excesses indicate the possible significant contribution from star formation and/or nuclear activity, not seen in low-z FR Is. Our sources display a wide variety of properties: from possible quasars at the highest luminosities, to low-luminosity old galaxies.

Keywords

Galaxies: active – galaxies: high-redshift – Galaxies: nuclei – Galaxies: photometry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 298 - 301
Copyright
Copyright © International Astronomical Union 2014 

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