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HerMES: SPIRE emission from radio-selected active galactic nuclei

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Authors
Seymour, Nick
Symeonidis, M.
Page, M.
Amblard, A.
Arumugam, V.
Aussel, H.
Blain, A.
Bock, J.
Boselli, A.
Buat, V.
Castro-Rodríguez, N.
Cava, A.
Chanial, P.
Clements, D.
Conley, A.
Conversi, L.
Cooray, A.
Dowell, C.
Dwek, E.
Eales, S.
Elbaz, D.
Franceschini, A.
Glenn, J.
Solares, E.
Griffin, M.
Hatziminaoglou, E.
Ibar, E.
Isaak, K.
Ivison, R.
Lagache, G.
Levenson, L.
Lu, N.
Madden, S.
Maffei, B.
Mainetti, G.
Marchetti, L.
Nguyen, H.
O'Halloran, B.
Oliver, S.
Omont, A.
Panuzzo, P.
Papageorgiou, A.
Pearson, C.
Pérez-Fournon, I.
Pohlen, M.
Rawlings, J.
Rizzo, D.
Roseboom, I.
Rowan-Robinson, M.
Schulz, B.
Scott, D.
Shupe, D.
Smith, A.
Stevens, J.
Trichas, M.
Tugwell, K.
Vaccari, M.
Valtchanov, I.
Vigroux, L.
Wang, L.
Wright, G.
Xu, C.
Zemcov, M.
Date
2011
Type
Journal Article

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Seymour, N. and Symeonidis, M. and Page, M. and Amblard, A. and Arumugam, V. and Aussel, H. and Blain, A. et al. 2011. HerMES: SPIRE emission from radio-selected active galactic nuclei. Monthly Notices of the Royal Astronomical Society. 413 (3): pp. 1777-1786.
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Monthly Notices of the Royal Astronomical Society
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Department of Physics and Astronomy
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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2011 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Abstract

We examine the rest-frame far-infrared emission from powerful radio sources with 1.4-GHz luminosity densities of 25 ≤ log(L1.4/W Hz−1) ≤ 26.5 in the extragalactic Spitzer First Look Survey field. We combine Herschel/SPIRE flux densities with Spitzer/Infrared Array Camera and Multiband Imaging Photometer for Spitzer infrared data to obtain total ( m) infrared luminosities for these radio sources. We separate our sources into a moderate, 0.4 < z < 0.9, and a high, 1.2 < z < 3.0, redshift sub-sample and we use Spitzer observations of a z < 0.1 3CRR sample as a local comparison. By comparison to numbers from the Square Kilometre Array (SKA) Simulated Skies, we find that our moderate-redshift sample is complete and our high-redshift sample is 14 per cent complete. We constrain the ranges of mean star formation rates (SFRs) to be 3.4–4.2, 18–41 and 80–581 M☉ yr−1 for the local, moderate- and high-redshift samples, respectively. Hence, we observe an increase in the mean SFR with increasing redshift which we can parametrize as ~(1 + z)Q, where Q = 4.2 ± 0.8. However, we observe no trends of mean SFR with radio luminosity within the moderate- or high-redshift bins. We estimate that radio-loud active galactic nuclei (AGN) in the high-redshift sample contribute 0.1–0.5 per cent to the total SFR density at that epoch. Hence, if all luminous starbursts host radio-loud AGN we infer a radio-loud phase duty cycle of 0.001–0.005.