Deep Herschel observations of the 2 Jy sample: assessing the non-thermal and AGN contributions to the far-IR continuum

Author:

Dicken D1ORCID,Tadhunter C N2,Nesvadba N P H3,Bernhard E2ORCID,Könyves V4,Morganti R56ORCID,Ramos Almeida C78ORCID,Oosterloo T56

Affiliation:

1. UK Astronomy Technology Centre, Royal Observatory Edinburgh , Blackford Hill, Edinburgh EH9 3HJ, UK

2. Department of Physics and Astronomy, University of Sheffield , Hounsfield Road, Sheffield S3 7RH, UK

3. Université de la Côte d’Azur , Observatoire de la Côte d’Azur, Laboratoire Lagrange, Bd de l’Observatoire, CS 34229, F-06304 Nice cedex 4, France

4. Jeremiah Horrocks Institute, University of Central Lancashire , Preston PR1 2HE, UK

5. ASTRON , P.O. Box 2, NL-7990 AA Dwingeloo, the Netherlands

6. Kapetyn Astronomical Institute, University of Groningen , Postbuss 800, NL-9700 AV Groningen, the Netherlands

7. Instituto de Astrofisica de Canarias , Calle Via Láctea, E-38205 La Laguna, Tenerife, Spain

8. Departamento de Astrofisica, Universidad de La Laguna , E-38206 La Laguna, Tenerife, Spain

Abstract

ABSTRACT The far-IR/sub-mm wavelength range contains a wealth of diagnostic information that is important for understanding the role of active galactic nuclei (AGN) in galaxy evolution. Here we present the results of Herschel PACS and SPIRE observations of a complete sample of 46 powerful 2 Jy radio AGN at intermediate redshifts (0.05 < z < 0.7), which represent the deepest pointed observations of a major sample of radio AGN undertaken by Herschel. In order to assess the importance of non-thermal synchrotron emission at far-IR wavelengths, we also present new APEX sub-mm and ALMA mm data. We find that the overall incidence of non-thermal contamination in the PACS bands (<200 μm) is in the range 28–43 per cent; however, this rises to 30–72 per cent for wavelengths (>200 μm) sampled by the SPIRE instrument. Non-thermal contamination is strongest in objects with compact CSS/GPS or extended FRI radio morphologies, and in those with type 1 optical spectra. Considering thermal dust emission, we find strong correlations between the 100 and 160 μm monochromatic luminosities and AGN power indicators, providing further evidence that radiation from the AGN may be an important heating source for the far-IR emitting dust. Clearly, AGN contamination – whether by the direct emission from synchrotron-emitting lobes and cores, or via radiative heating of the cool dust – needs to be carefully considered when using the far-IR continuum to measure the star formation rates in the host galaxies of radio AGN.

Funder

STFC

ESO

ESA

MCIU

European Union

AEI

European Regional Development Fund

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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